Childhood soft tissue sarcoma: Professional resources from the National Cancer Institute

Dramatic improvements in survival have been achieved for children and adolescents with cancer. Between 1975 and 2010, childhood cancer mortality decreased by more than 50%.[ 1] Childhood and adolescent cancer survivors require close monitoring because cancer therapy side effects may persist or develop months or years after treatment. (Refer to the PDQ summary on Late Effects of Treatment for Childhood Cancer for specific information about the incidence, type, and monitoring of late effects in childhood and adolescent cancer survivors.)

Rhabdomyosarcoma, a tumor of striated muscle, is the most common soft tissue sarcoma in children aged 0 to 14 years and accounts for 50% of tumors in this age group.[ 2] (Refer to the PDQ summary on Childhood Rhabdomyosarcoma Treatment for more information.) In pediatrics, the remaining soft tissue sarcomas are commonly referred to as nonrhabdomyosarcomatous soft tissue sarcomas and account for approximately 3% of all childhood tumors.[ 3] This heterogeneous group of tumors includes the following neoplasms:[ 4]

Distribution of Soft Tissue Sarcoma by Age and Histology

Pediatric soft tissue sarcomas are a heterogenous group of malignant tumors that originate from primitive mesenchymal tissue and account for 7% of all childhood tumors.[ 5]

The distribution of soft tissue sarcomas by histology and age, based on the Surveillance, Epidemiology, and End Results (SEER) information from 1975 to 2012, is depicted in Table 1 . The distribution of histologic subtypes by age is also shown in Figure 2 .

Nonrhabdomyosarcomatous soft tissue sarcomas are more common in adolescents and adults,[ 4] and most of the information regarding treatment and natural history of the disease in younger patients has been based on adult studies. The distributions of these tumors by age according to stage, histologic subtype, and tumor site are shown in Figures 1, 2, and 3, respectively.[ 6]

Risk Factors

Some genetic and environmental factors have been associated with the development of nonrhabdomyosarcomatous soft tissue sarcoma, including the following:

Clinical Presentation

Although nonrhabdomyosarcomatous soft tissue sarcomas can develop in any part of the body, they arise most commonly in the trunk and extremities.[ 18-20] These neoplasms can present initially as an asymptomatic solid mass, or they may be symptomatic because of local invasion of adjacent anatomical structures. Although rare, these tumors can arise primarily in brain tissue and are treated according to the histotype.[ 21]

Systemic symptoms (e.g., fever, weight loss, and night sweats) are rare. Hypoglycemia and hypophosphatemic rickets have been reported in cases of hemangiopericytoma, whereas hyperglycemia has been noted in patients with fibrosarcoma of the lung.[ 22]

Diagnostic and Staging Evaluation

When a suspicious lesion is identified, it is crucial that a complete workup, followed by adequate biopsy be performed. It is best to image the lesion using the following procedures before initiating any intervention:

The imaging characteristics of some tumors can be highly suggestive of this diagnosis. For example, the imaging characteristics of pediatric low-grade fibromyxoid sarcoma and alveolar soft part sarcoma have been described and can aid in the diagnosis of these rare neoplasms.[ 25]

Biopsy strategies

Although nonrhabdomyosarcomatous soft tissue tumors are fairly readily distinguished pathologically from rhabdomyosarcoma and Ewing sarcoma, the classification of childhood nonrhabdomyosarcomatous soft tissue sarcoma type is often difficult. Core-needle biopsy, incisional biopsy, or excisional biopsy can be used to diagnose a nonrhabdomyosarcomatous soft tissue sarcoma. If possible, the surgeon who will perform the definitive resection needs to be involved in the biopsy decision. Poorly placed incisional or needle biopsies may adversely affect the performance of the primary resection.

Considerations related to the selection of a biopsy procedure are as follows:

Unplanned resection

In children with unplanned resection of nonrhabdomyosarcomatous soft tissue sarcomas, primary re-excision is frequently recommended because many patients will have tumor present in the re-excision specimen.[ 37,38] A single-institution analysis of adolescents and adults compared patients with unplanned excision of soft tissue sarcoma to stage-matched controls. In this retrospective analysis, unplanned initial excision of soft tissue sarcoma resulted in increased risk of local recurrence, metastasis, and death; this increase was greatest for high-grade tumors.[ 39][Level of evidence: 3iiA ]

Chromosomal abnormalities

Many nonrhabdomyosarcomatous soft tissue sarcomas are characterized by chromosomal abnormalities. Some of these chromosomal translocations lead to a fusion of two disparate genes. The resulting fusion transcript can be readily detected by using polymerase chain reaction-based techniques, thus facilitating the diagnosis of those neoplasms that have translocations.

Some of the most frequent aberrations seen in nonrhabdomyosarcomatous soft tissue tumors are listed in Table 2 .

Prognosis

The prognosis of nonrhabdomyosarcomatous soft tissue sarcoma varies greatly depending on the following factors:[ 52-54]

Several adult and pediatric series have shown that patients with large or invasive tumors have a significantly worse prognosis than do those with small, noninvasive tumors. A retrospective review of soft tissue sarcomas in children and adolescents suggests that the 5 cm cutoff used for adults with soft tissue sarcoma may not be ideal for smaller children, especially infants. The review identified an interaction between tumor diameter and body surface area.[ 55] This relationship requires further study to determine the therapeutic implications of the observation.

In a review of a large adult series of nonrhabdomyosarcomatous soft tissue sarcomas, superficial extremity sarcomas had a better prognosis than did deep tumors. Thus, in addition to grade and size, the depth of invasion of the tumor should be considered.[ 56]

Some pediatric nonrhabdomyosarcomatous soft tissue sarcomas are associated with a better outcome. For instance, infantile fibrosarcoma, presenting in infants and children younger than 5 years, has an excellent prognosis given that surgery alone can cure a significant number of these patients and the tumor is highly chemosensitive.[ 3]

Soft tissue sarcomas in older children and adolescents often behave similarly to those in adult patients.[ 3,26] A large, prospective, multinational Children's Oncology Group study ( ARST0332 [NCT00346164] ) enrolled newly diagnosed patients younger than 30 years. Patients were assigned to treatment on the basis of their risk group (refer to Figure 4 ).[57][Level of evidence: 2A ]

Of 551 patients enrolled, at a median follow-up of 2.6 years, the preliminary analysis estimated the following 3-year survival rates:[ 57]

Pediatric patients with unresected localized nonrhabdomyosarcomatous soft tissue sarcomas have a poor outcome. Only about one-third of patients treated with multimodality therapy remain disease free.[ 52,58]; [ 59,60][Level of evidence: 3iiiA ] In a review of 30 Italian patients with nonrhabdomyosarcomatous soft tissue sarcoma at visceral sites, only ten patients survived at 5 years. Unfavorable prognostic factors included inability to achieve complete resection, large tumor size, tumor invasion, histologic subtype, and lung-pleura sites.[ 61][Level of evidence: 3iiB ]

In a pooled analysis from U.S. and European pediatric centers, outcome was better for patients whose tumor removal procedure was deemed complete than for patients whose tumor removal was incomplete. Outcome was better for patients who received radiation therapy than for patients who did not.[ 59][Level of evidence: 3iiiA ]

Because long-term related morbidity must be minimized while disease-free survival is maximized, the ideal therapy for each patient must be carefully and individually determined utilizing these prognostic factors before initiating therapy.[ 19,62-66]

Related Summaries

Refer to the following PDQ summaries for information about other types of sarcoma:

References

1. Smith MA, Altekruse SF, Adamson PC, et al.: Declining childhood and adolescent cancer mortality. Cancer 120 (16): 2497-506, 2014. [PUBMED Abstract]
2. Ries LA, Smith MA, Gurney JG, et al., eds.: Cancer incidence and survival among children and adolescents: United States SEER Program 1975-1995. Bethesda, Md: National Cancer Institute, SEER Program, 1999. NIH Pub.No. 99-4649. Also available online. Last accessed January 24, 2018.
3. Spunt SL, Million L, Coffin C: The nonrhabdomyosarcoma soft tissue sarcoma. In: Pizzo PA, Poplack DG, eds.: Principles and Practice of Pediatric Oncology. 7th ed. Philadelphia, Pa: Lippincott Williams and Wilkins, 2015, pp 827-54.
4. Weiss SW, Goldblum JR: General considerations. In: Weiss SW, Goldblum JR: Enzinger and Weiss's Soft Tissue Tumors. 5th ed. St. Louis, Mo: Mosby, 2008, pp 1-14.
5. Pappo AS, Pratt CB: Soft tissue sarcomas in children. Cancer Treat Res 91: 205-22, 1997. [PUBMED Abstract]
6. Ferrari A, Sultan I, Huang TT, et al.: Soft tissue sarcoma across the age spectrum: a population-based study from the Surveillance Epidemiology and End Results database. Pediatr Blood Cancer 57 (6): 943-9, 2011. [PUBMED Abstract]
7. Chang F, Syrjänen S, Syrjänen K: Implications of the p53 tumor-suppressor gene in clinical oncology. J Clin Oncol 13 (4): 1009-22, 1995. [PUBMED Abstract]
8. Plon SE, Malkin D: Childhood cancer and hereditary. In: Pizzo PA, Poplack DG, eds.: Principles and Practice of Pediatric Oncology. 7th ed. Philadelphia, Pa: Lippincott Williams and Wilkins, 2015, pp 13-31.
9. Groen EJ, Roos A, Muntinghe FL, et al.: Extra-intestinal manifestations of familial adenomatous polyposis. Ann Surg Oncol 15 (9): 2439-50, 2008. [PUBMED Abstract]
10. Kleinerman RA, Tucker MA, Abramson DH, et al.: Risk of soft tissue sarcomas by individual subtype in survivors of hereditary retinoblastoma. J Natl Cancer Inst 99 (1): 24-31, 2007. [PUBMED Abstract]
11. Eaton KW, Tooke LS, Wainwright LM, et al.: Spectrum of SMARCB1/INI1 mutations in familial and sporadic rhabdoid tumors. Pediatr Blood Cancer 56 (1): 7-15, 2011. [PUBMED Abstract]
12. Weiss SW, Goldblum JR: Benign tumors of peripheral nerves. In: Weiss SW, Goldblum JR: Enzinger and Weiss's Soft Tissue Tumors. 5th ed. St. Louis, Mo: Mosby, 2008, pp 825-901.
13. deCou JM, Rao BN, Parham DM, et al.: Malignant peripheral nerve sheath tumors: the St. Jude Children's Research Hospital experience. Ann Surg Oncol 2 (6): 524-9, 1995. [PUBMED Abstract]
14. Stark AM, Buhl R, Hugo HH, et al.: Malignant peripheral nerve sheath tumours--report of 8 cases and review of the literature. Acta Neurochir (Wien) 143 (4): 357-63; discussion 363-4, 2001. [PUBMED Abstract]
15. Goto M, Miller RW, Ishikawa Y, et al.: Excess of rare cancers in Werner syndrome (adult progeria). Cancer Epidemiol Biomarkers Prev 5 (4): 239-46, 1996. [PUBMED Abstract]
16. Weiss SW, Goldblum JR: Malignant fibrous histiocytoma (pleomorphic undifferentiated sarcoma). In: Weiss SW, Goldblum JR: Enzinger and Weiss's Soft Tissue Tumors. 5th ed. St. Louis, Mo: Mosby, 2008, pp 403-27.
17. McClain KL, Leach CT, Jenson HB, et al.: Association of Epstein-Barr virus with leiomyosarcomas in children with AIDS. N Engl J Med 332 (1): 12-8, 1995. [PUBMED Abstract]
18. Dillon P, Maurer H, Jenkins J, et al.: A prospective study of nonrhabdomyosarcoma soft tissue sarcomas in the pediatric age group. J Pediatr Surg 27 (2): 241-4; discussion 244-5, 1992. [PUBMED Abstract]
19. Rao BN: Nonrhabdomyosarcoma in children: prognostic factors influencing survival. Semin Surg Oncol 9 (6): 524-31, 1993 Nov-Dec. [PUBMED Abstract]
20. Zeytoonjian T, Mankin HJ, Gebhardt MC, et al.: Distal lower extremity sarcomas: frequency of occurrence and patient survival rate. Foot Ankle Int 25 (5): 325-30, 2004. [PUBMED Abstract]
21. Benesch M, von Bueren AO, Dantonello T, et al.: Primary intracranial soft tissue sarcoma in children and adolescents: a cooperative analysis of the European CWS and HIT study groups. J Neurooncol 111 (3): 337-45, 2013. [PUBMED Abstract]
22. Weiss SW, Goldblum JR: Miscellaneous tumors of intermediate malignancy. In: Weiss SW, Goldblum JR: Enzinger and Weiss's Soft Tissue Tumors. 5th ed. St. Louis, Mo: Mosby, 2008, pp 1093-1160.
23. Federico SM, Spunt SL, Krasin MJ, et al.: Comparison of PET-CT and conventional imaging in staging pediatric rhabdomyosarcoma. Pediatr Blood Cancer 60 (7): 1128-34, 2013. [PUBMED Abstract]
24. Tateishi U, Hosono A, Makimoto A, et al.: Accuracy of 18F fluorodeoxyglucose positron emission tomography/computed tomography in staging of pediatric sarcomas. J Pediatr Hematol Oncol 29 (9): 608-12, 2007. [PUBMED Abstract]
25. Sargar K, Kao SC, Spunt SL, et al.: MRI and CT of Low-Grade Fibromyxoid Sarcoma in Children: A Report From Children's Oncology Group Study ARST0332. AJR Am J Roentgenol 205 (2): 414-20, 2015. [PUBMED Abstract]
26. Weiss SW, Goldblum JR: Enzinger and Weiss's Soft Tissue Tumors. 4th ed. St. Louis, Mo: Mosby, 2001.
27. Recommendations for the reporting of soft tissue sarcomas. Association of Directors of Anatomic and Surgical Pathology. Mod Pathol 11 (12): 1257-61, 1998. [PUBMED Abstract]
28. Chowdhury T, Barnacle A, Haque S, et al.: Ultrasound-guided core needle biopsy for the diagnosis of rhabdomyosarcoma in childhood. Pediatr Blood Cancer 53 (3): 356-60, 2009. [PUBMED Abstract]
29. Coffin CM, Dehner LP, O'Shea PA: Pediatric Soft Tissue Tumors: A Clinical, Pathological, and Therapeutic Approach. Baltimore, Md: Williams and Wilkins, 1997.
30. Smith LM, Watterson J, Scott SM: Medical and surgical management of pediatric soft tissue tumors. In: Coffin CM, Dehner LP, O'Shea PA: Pediatric Soft Tissue Tumors: A Clinical, Pathological, and Therapeutic Approach. Baltimore, Md: Williams and Wilkins, 1997, pp 360-71.
31. Neville HL, Andrassy RJ, Lally KP, et al.: Lymphatic mapping with sentinel node biopsy in pediatric patients. J Pediatr Surg 35 (6): 961-4, 2000. [PUBMED Abstract]
32. Neville HL, Raney RB, Andrassy RJ, et al.: Multidisciplinary management of pediatric soft-tissue sarcoma. Oncology (Huntingt) 14 (10): 1471-81; discussion 1482-6, 1489-90, 2000. [PUBMED Abstract]
33. Kayton ML, Delgado R, Busam K, et al.: Experience with 31 sentinel lymph node biopsies for sarcomas and carcinomas in pediatric patients. Cancer 112 (9): 2052-9, 2008. [PUBMED Abstract]
34. Dall'Igna P, De Corti F, Alaggio R, et al.: Sentinel node biopsy in pediatric patients: the experience in a single institution. Eur J Pediatr Surg 24 (6): 482-7, 2014. [PUBMED Abstract]
35. Parida L, Morrisson GT, Shammas A, et al.: Role of lymphoscintigraphy and sentinel lymph node biopsy in the management of pediatric melanoma and sarcoma. Pediatr Surg Int 28 (6): 571-8, 2012. [PUBMED Abstract]
36. Alcorn KM, Deans KJ, Congeni A, et al.: Sentinel lymph node biopsy in pediatric soft tissue sarcoma patients: utility and concordance with imaging. J Pediatr Surg 48 (9): 1903-6, 2013. [PUBMED Abstract]
37. Chui CH, Spunt SL, Liu T, et al.: Is reexcision in pediatric nonrhabdomyosarcoma soft tissue sarcoma necessary after an initial unplanned resection? J Pediatr Surg 37 (10): 1424-9, 2002. [PUBMED Abstract]
38. Cecchetto G, Guglielmi M, Inserra A, et al.: Primary re-excision: the Italian experience in patients with localized soft-tissue sarcomas. Pediatr Surg Int 17 (7): 532-4, 2001. [PUBMED Abstract]
39. Qureshi YA, Huddy JR, Miller JD, et al.: Unplanned excision of soft tissue sarcoma results in increased rates of local recurrence despite full further oncological treatment. Ann Surg Oncol 19 (3): 871-7, 2012. [PUBMED Abstract]
40. Sandberg AA: Translocations in malignant tumors. Am J Pathol 159 (6): 1979-80, 2001. [PUBMED Abstract]
41. Slater O, Shipley J: Clinical relevance of molecular genetics to paediatric sarcomas. J Clin Pathol 60 (11): 1187-94, 2007. [PUBMED Abstract]
42. Mertens F, Antonescu CR, Hohenberger P, et al.: Translocation-related sarcomas. Semin Oncol 36 (4): 312-23, 2009. [PUBMED Abstract]
43. Romeo S, Dei Tos AP: Clinical application of molecular pathology in sarcomas. Curr Opin Oncol 23 (4): 379-84, 2011. [PUBMED Abstract]
44. Ladanyi M, Lui MY, Antonescu CR, et al.: The der(17)t(X;17)(p11;q25) of human alveolar soft part sarcoma fuses the TFE3 transcription factor gene to ASPL, a novel gene at 17q25. Oncogene 20 (1): 48-57, 2001. [PUBMED Abstract]
45. Ladanyi M: The emerging molecular genetics of sarcoma translocations. Diagn Mol Pathol 4 (3): 162-73, 1995. [PUBMED Abstract]
46. Williams A, Bartle G, Sumathi VP, et al.: Detection of ASPL/TFE3 fusion transcripts and the TFE3 antigen in formalin-fixed, paraffin-embedded tissue in a series of 18 cases of alveolar soft part sarcoma: useful diagnostic tools in cases with unusual histological features. Virchows Arch 458 (3): 291-300, 2011. [PUBMED Abstract]
47. Antonescu CR, Dal Cin P, Nafa K, et al.: EWSR1-CREB1 is the predominant gene fusion in angiomatoid fibrous histiocytoma. Genes Chromosomes Cancer 46 (12): 1051-60, 2007. [PUBMED Abstract]
48. Barnoud R, Sabourin JC, Pasquier D, et al.: Immunohistochemical expression of WT1 by desmoplastic small round cell tumor: a comparative study with other small round cell tumors. Am J Surg Pathol 24 (6): 830-6, 2000. [PUBMED Abstract]
49. Wang LL, Perlman EJ, Vujanic GM, et al.: Desmoplastic small round cell tumor of the kidney in childhood. Am J Surg Pathol 31 (4): 576-84, 2007. [PUBMED Abstract]
50. Errani C, Zhang L, Sung YS, et al.: A novel WWTR1-CAMTA1 gene fusion is a consistent abnormality in epithelioid hemangioendothelioma of different anatomic sites. Genes Chromosomes Cancer 50 (8): 644-53, 2011. [PUBMED Abstract]
51. Jain S, Xu R, Prieto VG, et al.: Molecular classification of soft tissue sarcomas and its clinical applications. Int J Clin Exp Pathol 3 (4): 416-28, 2010. [PUBMED Abstract]
52. Spunt SL, Hill DA, Motosue AM, et al.: Clinical features and outcome of initially unresected nonmetastatic pediatric nonrhabdomyosarcoma soft tissue sarcoma. J Clin Oncol 20 (15): 3225-35, 2002. [PUBMED Abstract]
53. Spunt SL, Poquette CA, Hurt YS, et al.: Prognostic factors for children and adolescents with surgically resected nonrhabdomyosarcoma soft tissue sarcoma: an analysis of 121 patients treated at St Jude Children's Research Hospital. J Clin Oncol 17 (12): 3697-705, 1999. [PUBMED Abstract]
54. Ferrari A, Casanova M, Collini P, et al.: Adult-type soft tissue sarcomas in pediatric-age patients: experience at the Istituto Nazionale Tumori in Milan. J Clin Oncol 23 (18): 4021-30, 2005. [PUBMED Abstract]
55. Ferrari A, Miceli R, Meazza C, et al.: Soft tissue sarcomas of childhood and adolescence: the prognostic role of tumor size in relation to patient body size. J Clin Oncol 27 (3): 371-6, 2009. [PUBMED Abstract]
56. Brooks AD, Heslin MJ, Leung DH, et al.: Superficial extremity soft tissue sarcoma: an analysis of prognostic factors. Ann Surg Oncol 5 (1): 41-7, 1998 Jan-Feb. [PUBMED Abstract]
57. Spunt SL, Million L, Anderson JR, et al.: Risk-based treatment for nonrhabdomyosarcoma soft tissue sarcomas (NRSTS) in patients under 30 years of age: Children’s Oncology Group study ARST0332. [Abstract] J Clin Oncol 32 (Suppl 15): A-10008, 2014. Also available online . Last accessed April 02, 2018.
58. O'Sullivan B, Davis AM, Turcotte R, et al.: Preoperative versus postoperative radiotherapy in soft-tissue sarcoma of the limbs: a randomised trial. Lancet 359 (9325): 2235-41, 2002. [PUBMED Abstract]
59. Ferrari A, Miceli R, Rey A, et al.: Non-metastatic unresected paediatric non-rhabdomyosarcoma soft tissue sarcomas: results of a pooled analysis from United States and European groups. Eur J Cancer 47 (5): 724-31, 2011. [PUBMED Abstract]
60. Smith KB, Indelicato DJ, Knapik JA, et al.: Definitive radiotherapy for unresectable pediatric and young adult nonrhabdomyosarcoma soft tissue sarcoma. Pediatr Blood Cancer 57 (2): 247-51, 2011. [PUBMED Abstract]
61. Ferrari A, Magni C, Bergamaschi L, et al.: Pediatric nonrhabdomyosarcoma soft tissue sarcomas arising at visceral sites. Pediatr Blood Cancer 64 (9): , 2017. [PUBMED Abstract]
62. Dillon PW, Whalen TV, Azizkhan RG, et al.: Neonatal soft tissue sarcomas: the influence of pathology on treatment and survival. Children's Cancer Group Surgical Committee. J Pediatr Surg 30 (7): 1038-41, 1995. [PUBMED Abstract]
63. Pappo AS, Fontanesi J, Luo X, et al.: Synovial sarcoma in children and adolescents: the St Jude Children's Research Hospital experience. J Clin Oncol 12 (11): 2360-6, 1994. [PUBMED Abstract]
64. Marcus KC, Grier HE, Shamberger RC, et al.: Childhood soft tissue sarcoma: a 20-year experience. J Pediatr 131 (4): 603-7, 1997. [PUBMED Abstract]
65. Pratt CB, Pappo AS, Gieser P, et al.: Role of adjuvant chemotherapy in the treatment of surgically resected pediatric nonrhabdomyosarcomatous soft tissue sarcomas: A Pediatric Oncology Group Study. J Clin Oncol 17 (4): 1219, 1999. [PUBMED Abstract]
66. Pratt CB, Maurer HM, Gieser P, et al.: Treatment of unresectable or metastatic pediatric soft tissue sarcomas with surgery, irradiation, and chemotherapy: a Pediatric Oncology Group study. Med Pediatr Oncol 30 (4): 201-9, 1998. [PUBMED Abstract]

World Health Organization (WHO) Classification of Soft Tissue Sarcomas

The WHO lists the following cell types in its classification of soft tissue sarcomas:[ 1,2]

References

1. Soft tissue sarcoma. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 291-6.
2. Brodowicz T, Schwameis E, Widder J, et al.: Intensified Adjuvant IFADIC Chemotherapy for Adult Soft Tissue Sarcoma: A Prospective Randomized Feasibility Trial. Sarcoma 4 (4): 151-60, 2000. [PUBMED Abstract]
3. Dantonello TM, Int-Veen C, Leuschner I, et al.: Mesenchymal chondrosarcoma of soft tissues and bone in children, adolescents, and young adults: experiences of the CWS and COSS study groups. Cancer 112 (11): 2424-31, 2008. [PUBMED Abstract]
4. Steelman C, Katzenstein H, Parham D, et al.: Unusual presentation of congenital infantile fibrosarcoma in seven infants with molecular-genetic analysis. Fetal Pediatr Pathol 30 (5): 329-37, 2011. [PUBMED Abstract]
5. Evans HL: Low-grade fibromyxoid sarcoma: a clinicopathologic study of 33 cases with long-term follow-up. Am J Surg Pathol 35 (10): 1450-62, 2011. [PUBMED Abstract]
6. Alaggio R, Collini P, Randall RL, et al.: Undifferentiated high-grade pleomorphic sarcomas in children: a clinicopathologic study of 10 cases and review of literature. Pediatr Dev Pathol 13 (3): 209-17, 2010 May-Jun. [PUBMED Abstract]

Clinical staging has an important role in predicting the clinical outcome and determining the most effective therapy for pediatric soft tissue sarcomas. As yet, there is no well-accepted staging system that is applicable to all childhood sarcomas. The system from the American Joint Committee on Cancer (AJCC) that is used for adults has not been validated in pediatric studies. Although a standardized staging system for pediatric nonrhabdomyosarcomatous soft tissue sarcoma does not exist, two systems are currently in use for staging pediatric nonrhabdomyosarcomatous soft tissue sarcoma.[ 1]

Intergroup Rhabdomyosarcoma Study Staging System

Nonmetastatic disease

Metastatic disease

Recurrent/progressive disease

TNM Staging System

The eighth edition of the AJCC Cancer Staging Manual has designated staging by the four criteria of tumor size, nodal status, histologic grade, and metastasis and by anatomic primary tumor site (head and neck; trunk and extremities; abdomen and thoracic visceral organs; retroperitoneum; and unusual histologies and sites) (refer to Tables 3, 4, 5, and 6).[3-7] For information on unusual histologies and sites, refer to the AJCC Cancer Staging Manual.[ 7]

Soft Tissue Sarcoma Tumor Pathological Grading System

In most cases, accurate histopathologic classification alone of soft tissue sarcomas does not yield optimal information about their clinical behavior. Therefore, several histologic parameters are evaluated in the grading process, including the following:

This process is used to improve the correlation between histologic findings and clinical outcome.[ 9] In children, grading of soft tissue sarcoma is compromised by the good prognosis of certain tumors, such as infantile fibrosarcoma and hemangiopericytoma, which have a good prognosis in children younger than 4 years, and also angiomatoid fibrous histiocytoma and dermatofibrosarcoma protuberans, which may recur locally if incompletely excised, but usually do not metastasize.

Testing the validity of a grading system within the pediatric population is difficult because of the rarity of these neoplasms. In March 1986, the Pediatric Oncology Group (POG) conducted a prospective study on pediatric soft tissue sarcomas other than rhabdomyosarcoma and devised the POG grading system . Analysis of outcome for patients with localized soft tissue sarcomas other than rhabdomyosarcoma demonstrated that patients with grade 3 tumors fared significantly worse than those with grade 1 or grade 2 lesions. This finding suggests that this system can accurately predict the clinical behavior of nonrhabdomyosarcomatous soft tissue sarcoma.[ 9-11]

The grading systems developed by the POG and the French Federation of Comprehensive Cancer Centers (Fédération Nationale des Centres de Lutte Contre Le Cancer [FNCLCC]) Sarcoma Group are described below. These grading systems are being compared by the central review pathologists on the COG-ARST0332 study. The study has closed and results are pending.

POG grading system

The POG grading system is described below.[ 9] It is an older grading system of historical value that is no longer being used for treatment.

Grade I

Grade I lesions are based on histologic type, well-differentiated cytohistologic features, and/or age of the patient.

Grade II

Grade II lesions are soft tissue sarcomas not included in grade I or III by histologic diagnosis (with <5 mitoses/10 high-power fields or <15% necrosis):

Grade III

Grade III lesions are similar to grade II lesions and include certain tumors known to be clinically aggressive by virtue of histologic diagnosis and non-grade I tumors (with >4 mitoses per 10 high-power fields or >15% necrosis):

FNCLCC grading system

The FNCLCC histologic grading system was developed for adults with soft tissue sarcoma. The purpose of the grading system is to predict which patients will develop metastasis and subsequently benefit from postoperative chemotherapy.[ 12,13] The system is described in Table 7 and Table 8 .

Prognostic Significance of Tumor Grading

The POG and FNCLCC grading systems have proven to be of prognostic value in pediatric and adult nonrhabdomyosarcomatous soft tissue sarcomas.[ 14-18] In a study of 130 tumors from children and adolescents with nonrhabdomyosarcomatous soft tissue sarcoma enrolled in three prospective clinical trials, a correlation was found between the POG-assigned grade and the FNCLCC-assigned grade. However, grading did not correlate in all cases; 44 patients whose tumors received discrepant grades (POG grade 3, FNCLCC grade 1 or 2) had outcomes between concurrent grade 3 and grades 1 and 2. A mitotic index of 10 or greater emerged as an important prognostic factor.[ 19] The recently completed COG-ARST0332 trial will analyze data comparing the POG and FNCLCC pathologic grading systems to determine which system better correlates with clinical outcomes. The current open trial ( ARST1321 [NCT02180867] ) uses the FNCLCC system to assign histological grade.

References

1. American Joint Committee on Cancer: AJCC Cancer Staging Manual. 6th ed. New York, NY: Springer, 2002.
2. Maurer HM, Beltangady M, Gehan EA, et al.: The Intergroup Rhabdomyosarcoma Study-I. A final report. Cancer 61 (2): 209-20, 1988. [PUBMED Abstract]
3. O'Sullivan B, Maki RG, Agulnik M, et al.: Soft tissue sarcoma of the head and neck. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp 499-505.
4. Yoon SS, Maki RG, Asare EA, et al.: Soft tissue sarcoma of the trunk and extremities. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp 507-15.
5. Raut CP, Maki RG, Baldini EH, et al.: Soft tissue sarcoma of the abdomen and thoracic visceral organs. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp 517-21.
6. Pollock RE, Maki RG, Baldini EH, et al.: Soft tissue sarcoma of the retroperitoneum. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp 531-7.
7. Maki RG, Folpe AL, Guadagnolo BA, et al.: Soft tissue sarcoma - unusual histologies and sites. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp 539-45.
8. Waxweiler TV, Rusthoven CG, Proper MS, et al.: Non-Rhabdomyosarcoma Soft Tissue Sarcomas in Children: A Surveillance, Epidemiology, and End Results Analysis Validating COG Risk Stratifications. Int J Radiat Oncol Biol Phys 92 (2): 339-48, 2015. [PUBMED Abstract]
9. Parham DM, Webber BL, Jenkins JJ 3rd, et al.: Nonrhabdomyosarcomatous soft tissue sarcomas of childhood: formulation of a simplified system for grading. Mod Pathol 8 (7): 705-10, 1995. [PUBMED Abstract]
10. Recommendations for the reporting of soft tissue sarcomas. Association of Directors of Anatomic and Surgical Pathology. Mod Pathol 11 (12): 1257-61, 1998. [PUBMED Abstract]
11. Skytting B, Meis-Kindblom JM, Larsson O, et al.: Synovial sarcoma--identification of favorable and unfavorable histologic types: a Scandinavian sarcoma group study of 104 cases. Acta Orthop Scand 70 (6): 543-54, 1999. [PUBMED Abstract]
12. Coindre JM, Terrier P, Guillou L, et al.: Predictive value of grade for metastasis development in the main histologic types of adult soft tissue sarcomas: a study of 1240 patients from the French Federation of Cancer Centers Sarcoma Group. Cancer 91 (10): 1914-26, 2001. [PUBMED Abstract]
13. Guillou L, Coindre JM, Bonichon F, et al.: Comparative study of the National Cancer Institute and French Federation of Cancer Centers Sarcoma Group grading systems in a population of 410 adult patients with soft tissue sarcoma. J Clin Oncol 15 (1): 350-62, 1997. [PUBMED Abstract]
14. Rao BN: Nonrhabdomyosarcoma in children: prognostic factors influencing survival. Semin Surg Oncol 9 (6): 524-31, 1993 Nov-Dec. [PUBMED Abstract]
15. Pisters PW, Leung DH, Woodruff J, et al.: Analysis of prognostic factors in 1,041 patients with localized soft tissue sarcomas of the extremities. J Clin Oncol 14 (5): 1679-89, 1996. [PUBMED Abstract]
16. Coindre JM, Terrier P, Bui NB, et al.: Prognostic factors in adult patients with locally controlled soft tissue sarcoma. A study of 546 patients from the French Federation of Cancer Centers Sarcoma Group. J Clin Oncol 14 (3): 869-77, 1996. [PUBMED Abstract]
17. Pappo AS, Fontanesi J, Luo X, et al.: Synovial sarcoma in children and adolescents: the St Jude Children's Research Hospital experience. J Clin Oncol 12 (11): 2360-6, 1994. [PUBMED Abstract]
18. Pratt CB, Maurer HM, Gieser P, et al.: Treatment of unresectable or metastatic pediatric soft tissue sarcomas with surgery, irradiation, and chemotherapy: a Pediatric Oncology Group study. Med Pediatr Oncol 30 (4): 201-9, 1998. [PUBMED Abstract]
19. Khoury JD, Coffin CM, Spunt SL, et al.: Grading of nonrhabdomyosarcoma soft tissue sarcoma in children and adolescents: a comparison of parameters used for the Fédération Nationale des Centers de Lutte Contre le Cancer and Pediatric Oncology Group Systems. Cancer 116 (9): 2266-74, 2010. [PUBMED Abstract]

Because of the rarity of pediatric nonrhabdomyosarcomatous soft tissue sarcomas, coordination of treatment by a multidisciplinary team comprising oncologists (pediatric or medical), pathologists, surgeons, and radiation oncologists should be considered for all children, adolescents, and young adults with these tumors. In addition, to better define the tumors' natural history and response to therapy, entry into national or institutional treatment protocols should be considered for children with rare neoplasms. Information about ongoing clinical trials is available from the NCI website .

Surgery

After an appropriate biopsy and pathologic diagnosis, every attempt is made to resect the primary tumor with negative margins before or after chemotherapy and/or radiation therapy. Involvement of a surgeon with special expertise in the resection of soft tissue sarcomas in the decision is highly desirable.

The timing of surgery depends on an assessment of the feasibility and morbidity of surgery. If the initial operation fails to achieve pathologically negative tissue margins or if the initial surgery was done without the knowledge that cancer was present, a re-excision of the affected area is performed to obtain clear, but not necessarily wide, margins.[ 1-4] This surgical tenet is true even if no mass is detected by magnetic resonance imaging after initial surgery.[ 5]; [ 6][Level of evidence: 3iiA ]

Regional lymph node metastases at diagnosis are unusual and are most often seen in patients with epithelioid and clear cell sarcomas.[ 7,8] Various institutional series have demonstrated the feasibility and effectiveness of sentinel node biopsy as a staging procedure in pediatric patients with soft tissue sarcomas.[ 9-14]

Radiation Therapy

Considerations for radiation therapy are based on the potential for surgery, with or without chemotherapy, to obtain local control without loss of critical organs or significant functional, cosmetic, or psychological impairment. This will vary according to the following:

Radiation therapy can be given preoperatively. Radiation field size and dose will be based on patient and tumor variables and the operability of the tumor. Preoperative radiation therapy has been associated with excellent local control rates.[ 15,16] This approach has the advantage of treating smaller tissue volumes because it does not necessitate treating a postsurgical bed; it also has the advantage of somewhat lower radiation doses because relative hypoxia from surgical disruption of vasculature and scarring is not present. Preoperative radiation therapy has been associated with an increased rate of wound complications in adults, primarily in lower extremity tumors, but the degree of this is questionable.[ 17] Conversely, preoperative radiation therapy may lead to less fibrosis than with postoperative approaches, perhaps due to the smaller treatment volume and dose.[ 18]

Retroperitoneal sarcomas are unique in that radiosensitivity of the bowel to injury makes postoperative radiation therapy less desirable.[ 19,20] Postoperative adhesions and bowel immobility can increase the risk of damage from any given radiation dose. This contrasts with the preoperative approach in which the tumor often displaces bowel outside of the radiation field, and any exposed bowel is more mobile, which decreases exposure to specific bowel segments.

Radiation therapy can also be given postoperatively. In general, radiation is indicated for patients with inadequate surgical margins and for larger, high-grade tumors.[ 21,22] This is particularly important in high-grade tumors with tumor margins smaller than 1 cm.[ 23,24]; [ 25][Level of evidence: 3iiDiv ] With combined surgery and radiation therapy, local control of the primary tumor can be achieved in more than 80% of patients.[ 26,27]

Brachytherapy and intraoperative radiation may be applicable in select situations.[ 27-29]; [ 30][Level of evidence: 3iiiDii ]

Radiation volume and dose depend on the patient, tumor, and surgical variables noted above, as well as the following:

Radiation doses are typically 45 Gy to 50 Gy preoperatively, with consideration for postoperative boost of 10 Gy to 20 Gy if resection margins are microscopically or grossly positive, or planned brachytherapy if the resection is predicted to be subtotal. However, data documenting the efficacy of a postoperative boost are lacking.[ 31] The postoperative radiation dose is 55 Gy to 60 Gy, or rarely, higher when unresectable gross residual disease exists.

Radiation margins are typically 2 cm to 4 cm longitudinally and encompass fascial planes axially.[ 32,33]

Chemotherapy

The role of postoperative chemotherapy remains unclear as evidenced by the following studies:[ 34]

Targeted Therapy

The use of angiogenesis and mammalian target of rapamycin (mTOR) inhibitors has been explored in the treatment of adult soft tissue sarcomas but not in pediatrics.

Special Considerations for the Treatment of Children With Soft Tissue Sarcoma

Cancer in children and adolescents is rare, although the overall incidence of childhood cancer has been slowly increasing since 1975.[ 41] Children and adolescents with cancer should be referred to medical centers that have a multidisciplinary team of cancer specialists with experience treating the cancers that occur during childhood and adolescence. This multidisciplinary team approach incorporates the skills of the following health care professionals and others to ensure that children receive treatment, supportive care, and rehabilitation that will achieve optimal survival and quality of life:

(Refer to the PDQ Supportive and Palliative Care summaries for specific information about supportive care for children and adolescents with cancer.)

Guidelines for pediatric cancer centers and their role in the treatment of pediatric patients with cancer have been outlined by the American Academy of Pediatrics.[ 42] At these pediatric cancer centers, clinical trials are available for most types of cancer that occur in children and adolescents, and the opportunity to participate in these trials is offered to most patients/families. Multidisciplinary evaluation in pediatric cancer centers that have surgical and radiotherapeutic expertise is of critical importance to ensure the best clinical outcome for these patients. Although surgery with or without radiation therapy can be curative for a significant proportion of patients, the addition of chemotherapy might benefit subsets of children with the disease; therefore, enrollment into clinical trials is encouraged. Clinical trials for children and adolescents with cancer are generally designed to compare potentially better therapy with therapy that is currently accepted as standard. Most of the progress made in identifying curative therapies for childhood cancers has been achieved through clinical trials. Information about ongoing clinical trials is available from the NCI website .

Many therapeutic strategies for children and adolescents with soft tissue tumors are similar to those for adult patients, although there are important differences. For example, the biology of the neoplasm in pediatric patients may differ dramatically from that of the adult lesion. Additionally, limb-sparing procedures are more difficult to perform in pediatric patients. The morbidity associated with radiation therapy, particularly in infants and young children, may be much greater than that observed in adults.[ 43]

Improved outcomes with multimodality therapy in adults and children with soft tissue sarcomas over the past 20 years has caused increasing concern about the potential long-term side effects of this therapy in children, especially when considering the expected longer life span of children versus adults. Therefore, to maximize tumor control and minimize long-term morbidity, treatment must be individualized for children and adolescents with nonrhabdomyosarcomatous soft tissue sarcoma. These patients should be enrolled in prospective studies that accurately assess any potential complications.[ 44]

References

1. Sugiura H, Takahashi M, Katagiri H, et al.: Additional wide resection of malignant soft tissue tumors. Clin Orthop (394): 201-10, 2002. [PUBMED Abstract]
2. Cecchetto G, Guglielmi M, Inserra A, et al.: Primary re-excision: the Italian experience in patients with localized soft-tissue sarcomas. Pediatr Surg Int 17 (7): 532-4, 2001. [PUBMED Abstract]
3. Chui CH, Spunt SL, Liu T, et al.: Is reexcision in pediatric nonrhabdomyosarcoma soft tissue sarcoma necessary after an initial unplanned resection? J Pediatr Surg 37 (10): 1424-9, 2002. [PUBMED Abstract]
4. Paulino AC, Ritchie J, Wen BC: The value of postoperative radiotherapy in childhood nonrhabdomyosarcoma soft tissue sarcoma. Pediatr Blood Cancer 43 (5): 587-93, 2004. [PUBMED Abstract]
5. Kaste SC, Hill A, Conley L, et al.: Magnetic resonance imaging after incomplete resection of soft tissue sarcoma. Clin Orthop (397): 204-11, 2002. [PUBMED Abstract]
6. Chandrasekar CR, Wafa H, Grimer RJ, et al.: The effect of an unplanned excision of a soft-tissue sarcoma on prognosis. J Bone Joint Surg Br 90 (2): 203-8, 2008. [PUBMED Abstract]
7. Daigeler A, Kuhnen C, Moritz R, et al.: Lymph node metastases in soft tissue sarcomas: a single center analysis of 1,597 patients. Langenbecks Arch Surg 394 (2): 321-9, 2009. [PUBMED Abstract]
8. Mazeron JJ, Suit HD: Lymph nodes as sites of metastases from sarcomas of soft tissue. Cancer 60 (8): 1800-8, 1987. [PUBMED Abstract]
9. Neville HL, Andrassy RJ, Lally KP, et al.: Lymphatic mapping with sentinel node biopsy in pediatric patients. J Pediatr Surg 35 (6): 961-4, 2000. [PUBMED Abstract]
10. Neville HL, Raney RB, Andrassy RJ, et al.: Multidisciplinary management of pediatric soft-tissue sarcoma. Oncology (Huntingt) 14 (10): 1471-81; discussion 1482-6, 1489-90, 2000. [PUBMED Abstract]
11. Kayton ML, Delgado R, Busam K, et al.: Experience with 31 sentinel lymph node biopsies for sarcomas and carcinomas in pediatric patients. Cancer 112 (9): 2052-9, 2008. [PUBMED Abstract]
12. Dall'Igna P, De Corti F, Alaggio R, et al.: Sentinel node biopsy in pediatric patients: the experience in a single institution. Eur J Pediatr Surg 24 (6): 482-7, 2014. [PUBMED Abstract]
13. Parida L, Morrisson GT, Shammas A, et al.: Role of lymphoscintigraphy and sentinel lymph node biopsy in the management of pediatric melanoma and sarcoma. Pediatr Surg Int 28 (6): 571-8, 2012. [PUBMED Abstract]
14. Alcorn KM, Deans KJ, Congeni A, et al.: Sentinel lymph node biopsy in pediatric soft tissue sarcoma patients: utility and concordance with imaging. J Pediatr Surg 48 (9): 1903-6, 2013. [PUBMED Abstract]
15. Virkus WW, Mollabashy A, Reith JD, et al.: Preoperative radiotherapy in the treatment of soft tissue sarcomas. Clin Orthop (397): 177-89, 2002. [PUBMED Abstract]
16. Zagars GK, Ballo MT, Pisters PW, et al.: Preoperative vs. postoperative radiation therapy for soft tissue sarcoma: a retrospective comparative evaluation of disease outcome. Int J Radiat Oncol Biol Phys 56 (2): 482-8, 2003. [PUBMED Abstract]
17. O'Sullivan B, Davis AM, Turcotte R, et al.: Preoperative versus postoperative radiotherapy in soft-tissue sarcoma of the limbs: a randomised trial. Lancet 359 (9325): 2235-41, 2002. [PUBMED Abstract]
18. Davis AM, O'Sullivan B, Turcotte R, et al.: Late radiation morbidity following randomization to preoperative versus postoperative radiotherapy in extremity soft tissue sarcoma. Radiother Oncol 75 (1): 48-53, 2005. [PUBMED Abstract]
19. Baldini EH, Wang D, Haas RL, et al.: Treatment Guidelines for Preoperative Radiation Therapy for Retroperitoneal Sarcoma: Preliminary Consensus of an International Expert Panel. Int J Radiat Oncol Biol Phys 92 (3): 602-12, 2015. [PUBMED Abstract]
20. Bishop AJ, Zagars GK, Torres KE, et al.: Combined Modality Management of Retroperitoneal Sarcomas: A Single-Institution Series of 121 Patients. Int J Radiat Oncol Biol Phys 93 (1): 158-65, 2015. [PUBMED Abstract]
21. Marcus KC, Grier HE, Shamberger RC, et al.: Childhood soft tissue sarcoma: a 20-year experience. J Pediatr 131 (4): 603-7, 1997. [PUBMED Abstract]
22. Delaney TF, Kepka L, Goldberg SI, et al.: Radiation therapy for control of soft-tissue sarcomas resected with positive margins. Int J Radiat Oncol Biol Phys 67 (5): 1460-9, 2007. [PUBMED Abstract]
23. Blakely ML, Spurbeck WW, Pappo AS, et al.: The impact of margin of resection on outcome in pediatric nonrhabdomyosarcoma soft tissue sarcoma. J Pediatr Surg 34 (5): 672-5, 1999. [PUBMED Abstract]
24. Skytting B: Synovial sarcoma. A Scandinavian Sarcoma Group project. Acta Orthop Scand Suppl 291: 1-28, 2000. [PUBMED Abstract]
25. Hua C, Gray JM, Merchant TE, et al.: Treatment planning and delivery of external beam radiotherapy for pediatric sarcoma: the St. Jude Children's Research Hospital experience. Int J Radiat Oncol Biol Phys 70 (5): 1598-606, 2008. [PUBMED Abstract]
26. Pratt CB, Pappo AS, Gieser P, et al.: Role of adjuvant chemotherapy in the treatment of surgically resected pediatric nonrhabdomyosarcomatous soft tissue sarcomas: A Pediatric Oncology Group Study. J Clin Oncol 17 (4): 1219, 1999. [PUBMED Abstract]
27. Merchant TE, Parsh N, del Valle PL, et al.: Brachytherapy for pediatric soft-tissue sarcoma. Int J Radiat Oncol Biol Phys 46 (2): 427-32, 2000. [PUBMED Abstract]
28. Schomberg PJ, Gunderson LL, Moir CR, et al.: Intraoperative electron irradiation in the management of pediatric malignancies. Cancer 79 (11): 2251-6, 1997. [PUBMED Abstract]
29. Nag S, Shasha D, Janjan N, et al.: The American Brachytherapy Society recommendations for brachytherapy of soft tissue sarcomas. Int J Radiat Oncol Biol Phys 49 (4): 1033-43, 2001. [PUBMED Abstract]
30. Viani GA, Novaes PE, Jacinto AA, et al.: High-dose-rate brachytherapy for soft tissue sarcoma in children: a single institution experience. Radiat Oncol 3: 9, 2008. [PUBMED Abstract]
31. Al Yami A, Griffin AM, Ferguson PC, et al.: Positive surgical margins in soft tissue sarcoma treated with preoperative radiation: is a postoperative boost necessary? Int J Radiat Oncol Biol Phys 77 (4): 1191-7, 2010. [PUBMED Abstract]
32. Wang D, Bosch W, Kirsch DG, et al.: Variation in the gross tumor volume and clinical target volume for preoperative radiotherapy of primary large high-grade soft tissue sarcoma of the extremity among RTOG sarcoma radiation oncologists. Int J Radiat Oncol Biol Phys 81 (5): e775-80, 2011. [PUBMED Abstract]
33. Bahig H, Roberge D, Bosch W, et al.: Agreement among RTOG sarcoma radiation oncologists in contouring suspicious peritumoral edema for preoperative radiation therapy of soft tissue sarcoma of the extremity. Int J Radiat Oncol Biol Phys 86 (2): 298-303, 2013. [PUBMED Abstract]
34. Ferrari A: Role of chemotherapy in pediatric nonrhabdomyosarcoma soft-tissue sarcomas. Expert Rev Anticancer Ther 8 (6): 929-38, 2008. [PUBMED Abstract]
35. Adjuvant chemotherapy for localised resectable soft-tissue sarcoma of adults: meta-analysis of individual data. Sarcoma Meta-analysis Collaboration. Lancet 350 (9092): 1647-54, 1997. [PUBMED Abstract]
36. Woll PJ, Reichardt P, Le Cesne A, et al.: Adjuvant chemotherapy with doxorubicin, ifosfamide, and lenograstim for resected soft-tissue sarcoma (EORTC 62931): a multicentre randomised controlled trial. Lancet Oncol 13 (10): 1045-54, 2012. [PUBMED Abstract]
37. Spunt SL, Million L, Anderson JR, et al.: Risk-based treatment for nonrhabdomyosarcoma soft tissue sarcomas (NRSTS) in patients under 30 years of age: Children’s Oncology Group study ARST0332. [Abstract] J Clin Oncol 32 (Suppl 15): A-10008, 2014. Also available online . Last accessed April 02, 2018.
38. Demetri GD, Chawla SP, Ray-Coquard I, et al.: Results of an international randomized phase III trial of the mammalian target of rapamycin inhibitor ridaforolimus versus placebo to control metastatic sarcomas in patients after benefit from prior chemotherapy. J Clin Oncol 31 (19): 2485-92, 2013. [PUBMED Abstract]
39. van der Graaf WT, Blay JY, Chawla SP, et al.: Pazopanib for metastatic soft-tissue sarcoma (PALETTE): a randomised, double-blind, placebo-controlled phase 3 trial. Lancet 379 (9829): 1879-86, 2012. [PUBMED Abstract]
40. Mir O, Brodowicz T, Italiano A, et al.: Safety and efficacy of regorafenib in patients with advanced soft tissue sarcoma (REGOSARC): a randomised, double-blind, placebo-controlled, phase 2 trial. Lancet Oncol 17 (12): 1732-1742, 2016. [PUBMED Abstract]
41. Smith MA, Altekruse SF, Adamson PC, et al.: Declining childhood and adolescent cancer mortality. Cancer 120 (16): 2497-506, 2014. [PUBMED Abstract]
42. Corrigan JJ, Feig SA; American Academy of Pediatrics: Guidelines for pediatric cancer centers. Pediatrics 113 (6): 1833-5, 2004. [PUBMED Abstract]
43. Suit H, Spiro I: Radiation as a therapeutic modality in sarcomas of the soft tissue. Hematol Oncol Clin North Am 9 (4): 733-46, 1995. [PUBMED Abstract]
44. Spunt SL, Million L, Coffin C: The nonrhabdomyosarcoma soft tissue sarcoma. In: Pizzo PA, Poplack DG, eds.: Principles and Practice of Pediatric Oncology. 7th ed. Philadelphia, Pa: Lippincott Williams and Wilkins, 2015, pp 827-54.

Adipocytic Tumors

Liposarcoma

Liposarcoma accounts for 3% of soft tissue sarcoma in patients younger than 20 years (refer to Table 1 ).

Liposarcoma is rare in the pediatric population. In a review of 182 pediatric patients with adult-type sarcomas, only 14 had a diagnosis of liposarcoma.[ 1] One retrospective study identified 34 patients younger than 22 years from 1960 to 2011.[ 2] There were roughly equal numbers of male and female patients and the median age was 18 years. In an international clinicopathological review, the characteristics of 82 cases of pediatric liposarcoma were reported. The median age was 15.5 years and females were more commonly affected.[ 3] In both reports, the great majority of patients had myxoid liposarcoma.

Histopathologic classification

The World Health Organization (WHO) classification for liposarcoma is as follows:

Clinical presentation

The majority of liposarcomas in the pediatric and adolescent age range are low grade and located subcutaneously. Metastasis to lymph nodes is very uncommon, and the great majority of metastases are pulmonary. Tumors arising in the periphery are more likely to be low grade and myxoid. Tumors arising centrally are more likely to be high grade, pleomorphic, and present with metastasis or recur with metastasis.

Prognosis

Higher grade or central tumors are associated with a significantly higher risk of death. In a retrospective review, 5-year survival for central tumors was 42%. In the international review, seven of ten patients with pleomorphic myxoid liposarcoma died because of their disease.[ 3] In a retrospective study of 14 patients, 5-year survival was 78% and tumor grade, histologic subtype, and primary location correlated with survival.[ 2]

Treatment

Treatment options for liposarcoma include the following:

Surgery is the most important treatment for liposarcoma. After surgical resection of myxoid liposarcoma, event-free survival (EFS) and overall survival (OS) are roughly 90%. If initial surgery is incomplete, re-excision should be performed to achieve a wide margin of resection. Local recurrences have been seen and are controlled with a second resection of the tumor.

There are reports of the use of chemotherapy to decrease the size of liposarcoma before surgery to facilitate complete resection, particularly in central tumors.[ 10,11] The role of postoperative chemotherapy for liposarcoma is poorly defined. There does not appear to be a need for any postoperative therapy for completely resected myxoid liposarcoma. Even with the use of postoperative chemotherapy, the survival of pleomorphic liposarcoma remains poor.[ 12]

Trabectedin has produced encouraging responses in adults with advanced myxoid liposarcoma.[ 13] In one study, adult patients with recurrent liposarcoma and leiomyosarcoma were randomly assigned to treatment with either trabectedin or dacarbazine. Patients treated with trabectedin had a 45% reduction in disease progression.[ 14][Level of evidence: 1iiDiii ] There are very limited data to support the use of trabectedin in pediatric patients.[ 15]

Treatment options under clinical evaluation

Information about National Cancer Institute (NCI)–supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following is an example of a national and/or institutional clinical trial that is currently being conducted:

Chondro-osseous Tumors

Chondro-osseous tumors include the following tumor subtypes:

Extraskeletal mesenchymal chondrosarcoma

Osseous and chondromatous neoplasms account for 0.8% of soft tissue sarcoma in patients younger than 20 years (refer to Table 1 ).

Histopathology and molecular features

Mesenchymal chondrosarcoma is a rare tumor characterized by small round cells and hyaline cartilage that more commonly affects young adults and has a predilection for involving the head and neck region.

Mesenchymal chondrosarcoma has been associated with consistent chromosomal rearrangement. A retrospective analysis of cases of mesenchymal chondrosarcoma identified a HEY1-NCOA2 fusion in 10 of 15 tested specimens.[ 16] This gene fusion was not associated with chromosomal changes that could be detected by karyotyping. In one instance, translocation t(1;5)(q42;q32) was identified in a case of mesenchymal chondrosarcoma and shown to be associated with a novel IRF2BP-CDX1 fusion gene.[ 17]

Prognosis

A retrospective survey of European institutions identified 113 children and adults with mesenchymal chondrosarcoma. Factors associated with better outcome included the following:[ 18][Level of evidence: 3iiiA ]

Treatment

Treatment options for extraskeletal mesenchymal chondrosarcoma include the following:

A review of 15 patients younger than 26 years from the German Cooperative Soft Tissue Sarcoma Study Group (11 with soft-tissue lesions) and the German-Austrian-Swiss Cooperative Osteosarcoma Study Group (four with primary bone lesions) protocols suggests that complete surgical removal, or incomplete resection followed by radiation therapy, is necessary for local control.[ 19][Level of evidence: 3iiA ]

A single-institution, retrospective review identified 12 pediatric patients with mesenchymal chondrosarcoma.[ 20] The presence of the NCOA2 rearrangement in tumors was documented in these patients. It was also confirmed that surgical resection is necessary for cure. Eleven patients presented with localized disease and one presented with pulmonary nodules. All patients received chemotherapy—six patients before and after surgical resection and six patients only after resection. All patients received postoperative chemotherapy (most commonly ifosfamide/doxorubicin) with or without radiation therapy (median dose, 59.4 Gy). At a median follow-up of 4.8 years, 5-year disease-free survival (DFS) was 68.2% (95% CI, 39.8%–96.6%) and OS was 88.9% (95% CI, 66.9%–100%).

Extraskeletal osteosarcoma

Osseous and chondromatous neoplasms account for 0.8% of soft tissue sarcomas in patients younger than 20 years (refer to Table 1 ).

Extraskeletal osteosarcoma is extremely rare in the pediatric and adolescent age range. A 2003 review identified only ten case reports in the medical literature.[ 21]

Prognosis

Extraskeletal osteosarcoma is associated with a high risk of local recurrence and pulmonary metastasis.[ 22]

Treatment

Treatment options for extraskeletal osteosarcoma include the following:

(Refer to the PDQ summary on Osteosarcoma and Malignant Fibrous Histiocytoma of Bone Treatment for more information.)

Treatment options under clinical evaluation

Information about National Cancer Institute NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following is an example of a national and/or institutional clinical trial that is currently being conducted:

Fibroblastic/Myofibroblastic Tumors

Fibroblastic/myofibroblastic tumors include the following tumor subtypes:

Desmoid-type fibromatosis

Desmoid-type fibromatosis has previously been called desmoid tumors or aggressive fibromatoses.

Risk factors

A small number of desmoid-type fibromatosis tumors may occur in association with a mutation in the adenomatous polyposis coli ( APC) gene (associated with intestinal polyps and a high incidence of colon cancer). In a study of 519 patients older than 10 years with a diagnosis of desmoid-type fibromatosis, 39 (7.5%, a possible underestimation) were found to have familial adenomatous polyposis (FAP).[ 23] The patients with FAP and desmoid-type fibromatosis were younger, more often male, and had more abdominal wall or mesenteric tumors than did patients with desmoid-type fibromatosis without FAP.

A family history of colon cancer, the presence of congenital hyperplasia of the retinal pigment epithelium,[ 24,25] or location of the desmoid-type fibromatosis in the abdomen or abdominal wall [ 23] should prompt referral to a genetic counselor. Currently, there are no general recommendations for genetic testing in children with desmoid-type fibromatosis. Pathology and molecular characteristics of the tumor only provide guidance for screening. If the tumor has a somatic CTNNB1 mutation, screening is not necessary, because the APC gene mutation has not been described in this setting. If a CTNNB1 mutation is not identified, screening for the APC mutation may be warranted.[ 26,27] (Refer to the Familial Adenomatous Polyposis (FAP) section of the PDQ summary on Genetics of Colorectal Cancer for more information.)

Prognosis

Desmoid-type fibromatosis has an extremely low potential to metastasize. The tumors are locally infiltrating, and surgical control can be difficult because of the need to preserve normal structures.

These tumors have a high potential for local recurrence. Desmoid-type fibromatosis has a highly variable natural history, including well documented examples of spontaneous regression.[ 28] Mutations in exon 3 of the beta-catenin gene are seen in over 80% of desmoid-type fibromatosis and the mutation 45F has been associated with an increased risk of disease recurrence.[ 29] Repeated surgical resection can sometimes bring recurrent lesions under control.[ 30]

Treatment

Evaluation of the benefit of interventions for treatment of desmoid-type fibromatosis has been extremely difficult, because desmoid-type fibromatosis has a highly variable natural history. Large adult series and smaller pediatric series have reported long periods of disease stabilization and even regression without systemic therapy.[ 30,31]; [ 32][Level of evidence: 3iiiDi ]

Treatment options for desmoid-type fibromatosis include the following:

The treatment of choice is resection to achieve clear margins. However, a retrospective review of children who underwent surgery for desmoid-type fibromatosis at the St. Jude Children’s Research Hospital (SJCRH) reported no correlation between surgical margins and risk of recurrence.[ 39]

When the diagnosis is known and complete surgical excision is not feasible, and if the tumor poses significant potential for mortality or morbidity, preoperative strategies may include the following:[ 40,41]

Desmoid-type fibromatosis often behaves in a nonaggressive manner. In a study that included mostly adults with extra-abdominal primary fibromatosis, nonsurgical approaches (medical and observation) had similar 3-year EFS compared with surgery.[ 34] In a subsequent study of adolescents and adults with abdominal wall aggressive fibromatosis, 102 patients were treated with a watch and wait approach, of which 65 patients required no further treatment at 3 years. Approximately one-third of patients had regression of the tumor.[ 33]

Chemotherapy regimens may include the following:

Other drug therapy may include the following:

Postoperative radiation therapy is a consideration when progression would entail additional surgery that might cause functional or cosmetic compromise and if radiation is considered acceptable in terms of morbidities.

Radiation has been used for unresectable desmoid-type fibromatosis or postoperatively for tumors with inadequate resections. The potential long-term complications of radiation therapy, especially subsequent neoplasms, make using this modality less appealing in a young population.[ 57]

Dermatofibrosarcoma protuberans

Dermatofibrosarcoma is a rare tumor that can be present in all age groups, but many of the reported cases arise in children.[ 58-60] A review of 451 cases in children younger than 20 years in the SEER database found that the incidence was 1 case per 1 million, highest among black patients aged 15 to 19 years. The most common sites were trunk and extremities, which is similar to what is found in adults. Ninety-five percent of patients underwent surgery. OS was 100% at 5 years, 98% at 15 years, and 97% at 30 years. Males had decreased survival compared with females ( P < .05).[ 61][Level of evidence: 3iA ]

Molecular features

The tumor has a consistent chromosomal translocation t(17;22)(q22;q13) that juxtaposes the COL1A1 gene with the PDGF-beta gene.

Treatment

Treatment of dermatofibrosarcoma protuberans includes the following:

Most dermatofibrosarcoma tumors can be cured by complete surgical resection. Wide excision with negative margins or Mohs or modified Mohs surgery will prevent most tumors from recurring.[ 62] Despite the locally aggressive behavior of the tumor, lymph node or visceral metastasis rarely occurs.

In retrospective reviews, postoperative radiation therapy after incomplete excision may have decreased the likelihood of recurrence.[ 63,64]

When surgical resection cannot be accomplished or the tumor is recurrent, treatment with imatinib has been effective.[ 65-67] Because metastatic disease is more likely after multiple recurrences, radiation or other adjuvant therapy should be considered in patients with recurrence that cannot be managed surgically.[ 59,61]

Guidelines for workup and management of dermatofibrosarcoma protuberans have been published.[ 68]

Infantile fibrosarcoma

There are two distinct types of fibrosarcoma in children and adolescents: infantile fibrosarcoma (also called congenital fibrosarcoma) and fibrosarcoma that is indistinguishable from fibrosarcoma seen in adults. These are two distinct pathologic diagnoses and require different treatments. Adult-type fibrosarcoma is addressed below.

Infantile fibrosarcoma usually occurs in children younger than 1 year. It occasionally occurs in children up to age 4 years. A tumor with similar morphology has been identified in older children; in these older children, the tumors do not have the t(12;15)( ETV-NTRK3) translocation that is characteristic of the younger patients.[ 69] In several of these patients, BRAF gene fusions have been identified.

Clinical presentation

Infantile fibrosarcoma usually presents with a rapidly growing mass, often noted at birth or even seen in prenatal ultrasound. The tumors are often quite large at the time of presentation.[ 70]

Molecular features

The tumor usually has a characteristic cytogenetic translocation t(12;15)( ETV-NTRK3). Infantile fibrosarcoma shares this translocation and a virtually identical histologic appearance with mesoblastic nephroma.

Prognosis

These tumors have a low incidence of metastases at diagnosis.

Treatment

Treatment options for infantile fibrosarcoma include the following:

Complete resection is curative in the majority of patients with infantile fibrosarcoma. However, the large size of the lesion frequently makes resection without major functional consequences impossible (for instance, tumors of the extremities often require amputation for complete excision). The European pediatric group has reported that observation may also be an option in patients with group II disease after surgery.[ 71] Twelve patients with group II disease received no further therapy and two patients relapsed. One patient obtained a complete remission after chemotherapy. Postoperative chemotherapy was administered to patients with higher group disease and those who progressed. In a subsequent study, only one of seven patients with group II disease progressed during observation; that patient achieved complete remission with chemotherapy.[ 72][Level of evidence: 3iiA ]

Preoperative chemotherapy has made a more conservative surgical approach possible; agents active in this setting include vincristine, dactinomycin, cyclophosphamide, and ifosfamide.[ 73,74]; [ 72,75][Level of evidence: 3iiA ]; [ 76][Level of evidence: 3iiB ]

Three studies of patients with infantile fibrosarcoma suggest that an alkylator-free regimen is effective and should be used as the first treatment choice in patients with macroscopic disease.[ 71,72,77] Two cases with variant LMNA/NTRK1 fusions responded to crizotinib.[ 78,79]

A pediatric patient (aged 16 months) with refractory infantile fibrosarcoma with constitutive activation of the tropomyosin-related kinase signaling pathway from an ETS variant gene 6– neurotrophin 3 receptor gene fusion ( ETV6-NTRK3) responded to LOXO-101, with a 90% reduction in tumor size after 2 months of treatment.[ 80]

A patient aged 2 months with infantile fibrosarcoma was initially treated with chemotherapy. At disease progression, a response was seen with pazopanib.[ 81]

A rare case of spontaneous regression without treatment has been reported.[ 82][Level of evidence: 3iiiDiv ]

Treatment options under clinical evaluation

Information about NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following are examples of national and/or institutional clinical trials that are currently being conducted:

Inflammatory myofibroblastic tumor

Inflammatory myofibroblastic tumor is a rare mesenchymal tumor that has a predilection for children and adolescents.[ 83-85]

Clinical presentation

Inflammatory myofibroblastic tumors are rare tumors that affect soft tissues and visceral organs of children and young adults.[ 86] They rarely metastasize but tend to be locally invasive. Usual anatomical sites of disease include soft tissue, lungs, spleen, colon, and breast.[ 83] A review of 42 cases of pediatric inflammatory myofibroblastic tumor of the bladder was published in 2015.[ 87]

Molecular features

Roughly half of inflammatory myofibroblastic tumors exhibit a clonal mutation that activates the anaplastic lymphoma kinase ( ALK)-receptor tyrosine kinase gene at chromosome 2p23.[ 88] ROS1 and PDGFR-beta kinase fusions have been identified in 8 of 11 cases (73%) who are negative for ALK by immunohistochemistry.[ 89][Level of evidence: 3iiiDiv ]

Prognosis

Inflammatory myofibroblastic tumor recurs frequently but is rarely metastatic.[ 83-85]

Treatment

Treatment options for inflammatory myofibroblastic tumor include the following:

Complete surgical removal, when feasible, is the mainstay of therapy.[ 90] In a series of nine patients, four patients achieved continuous remission after complete resection, three patients with residual disease recurred but later achieved continuous remission, and one patient with metastatic disease responded to multiagent chemotherapy.[ 91][Level of evidence: 3iiA ] The benefit of chemotherapy has been noted in case reports.[ 92] There are case reports of response to either steroids or NSAIDs.[ 93,94] A series of 32 patients aged 18 years and younger found that complete excision was the mainstay of therapy, although some patients were treated with steroids or cytotoxic chemotherapy. OS was 94%; three patients relapsed and two of them died of the disease. With complete excision, with or without other treatments such as steroids, there was a high survival rate for patients with this disease.[ 95][Level of evidence: 3iiA ]

Inflammatory myofibroblastic tumors respond to crizotinib. Two adults with ALK-rearranged inflammatory myofibroblastic tumor achieved partial response with crizotinib.[ 96][Level of evidence: 3iiiDiv ] For pediatric patients with measurable disease, the use of crizotinib achieved partial tumor responses in three of six patients with ALK-translocated inflammatory myofibroblastic tumors.[ 97] A case report of a patient aged 16 years with metastatic/multifocal ALK-positive inflammatory myofibroblastic tumor demonstrated a complete response and a 3-year disease-free interval with crizotinib therapy.[ 98] In a phase I trial of ceritinib for adult patients previously treated with ALK inhibitors, one patient with inflammatory myofibroblastic tumor had a partial response.[ 99] Finally, one study included 14 patients with inflammatory myofibroblastic tumor who were treated with crizotinib. With crizotinib therapy, five patients had a complete response, seven had a partial response, and the remaining two had stable disease; no patient had relapsed at the time the article was published.[ 100][Level of evidence: 3iiDiv ]

Adult-type fibrosarcoma

These tumors lack the translocation seen in infantile fibrosarcomas. They present like the great majority of nonrhabdomyosarcomas and the management approach is similar.

Low-grade fibromyxoid sarcoma

Low-grade fibromyxoid sarcoma is a histologically deceptive soft tissue neoplasm that most commonly affects young and middle-aged adults, is commonly located deep within the extremities, and is characterized by a FUS/CREB3L3 translocation.[ 101,102]

Prognosis

In a review of 33 patients (three were younger than 18 years) with low grade fibromyxoid sarcoma, 21 of 33 patients developed a local recurrence after intervals of up to 15 years (median, 3.5 years) and 15 developed metastases up to 45 years (median, 5 years) from diagnosis, most commonly to the lungs and pleura, emphasizing the need for continued follow-up of these patients.[ 101] Even after metastases occur, the course may be indolent.[ 103]

In another report, 14 of 73 cases were younger than 18 years of age. In this series with a relatively short follow up (median of 24 months), only 8 of 54 patients with adequate follow up developed local (9%) or distant (6%) recurrence. This report suggests that the behavior of this tumor might be significantly better than previously reported.[ 104] However, because of the occurrence of late metastases, careful monitoring of these patients is warranted.

The most recent Children's Oncology Group (COG) trial ( ARST0332 [NCT00346164] ) enrolled 11 patients with this tumor entity. The median age at diagnosis was 13 years and males were more commonly affected. The most common sites were the lower and upper extremity (n = 9) and none of the patients had developed local or distant disease recurrence at a median follow up of 2.7 years.[ 105]

Treatment

Treatment options for low-grade fibromyxoid sarcoma include the following:

The limited treatment information for low-grade fibromyxoid sarcoma suggest that surgery is the treatment of choice as the tumor is not very chemosensitive.[ 103] There are little data regarding the use of chemotherapy and/or radiation therapy in this disease. One report suggests that trabectedin may be effective in the treatment of low-grade fibromyxoid sarcoma.[ 106]

Myxofibrosarcoma

Myxofibrosarcoma is a rare lesion, especially in childhood. It is typically treated with complete surgical resection.

Sclerosing epithelioid fibrosarcoma

Sclerosing epithelioid fibrosarcoma is a rare malignant sarcoma that commonly harbors EWSR1 gene rearrangements and has an aggressive clinical course.[ 107] It is typically treated with complete surgical excision. Long-term follow-up is recommended because local recurrence and metastases can occur late.

Treatment options under clinical evaluation

Information about NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following is an example of a national and/or institutional clinical trial that is currently being conducted:

Skeletal Muscle Tumors

Rhabdomyosarcoma

Refer to the PDQ summary on Childhood Rhabdomyosarcoma Treatment for more information.

Smooth Muscle Tumors

Leiomyosarcoma

Leiomyosarcoma accounts for 2% of soft tissue sarcoma in patients younger than 20 years (refer to Table 1 ).

Risk factors

Among 43 children with HIV/AIDS who developed tumors, eight developed Epstein-Barr virus–associated leiomyosarcoma.[ 108] Survivors of hereditary retinoblastoma have a statistically significant increased risk of developing leiomyosarcoma and 78% of these were diagnosed 30 or more years after the initial diagnosis of retinoblastoma.[ 109]

Treatment

Treatment options for leiomyosarcoma include the following:

In an open-label study of trabectedin in adult patients with recurrent sarcomas, the best overall response rate (complete remission and partial remission) was seen in patients with leiomyosarcoma (7.5%).[ 110] The clinical benefit rate (includes stable disease) for leiomyosarcoma was 54%. In another adult study, patients with recurrent liposarcoma and leiomyosarcoma were randomly assigned to receive treatment with either trabectedin or dacarbazine. Patients treated with trabectedin had a 45% reduction in disease progression.[ 14] There are no data to support the use of trabectedin in pediatric patients.

Treatment options under clinical evaluation

Information about NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following is an example of a national and/or institutional clinical trial that is currently being conducted:

So-called Fibrohistiocytic Tumors

So-called fibrohistiocytic tumors include the following tumor subtypes:

Plexiform fibrohistiocytic tumor

Plexiform histiocytic tumor is a rare, low- to intermediate-grade tumor that most commonly affects children and young adults. Depending on the series, the median age at presentation ranges from 8 to 14.5 years; however, the tumor has been described in patients as young as 3 months.[ 111,112]

Clinical presentation

The tumor commonly arises as a painless mass in the skin or subcutaneous tissue and most often involves the upper extremities, including the fingers, hand, and wrist.[ 113-115] There are rare reports of spread to regional lymph nodes or the lungs.[ 111,115,116]

Molecular features

No consistent chromosomal anomalies have been detected but a t(4;15)(q21;q15) translocation has been reported.[ 117]

Prognosis

Plexiform fibrohistiocytic tumor is an intermediate-grade tumor that rarely metastasizes.

Treatment

Surgery is the treatment of choice but local recurrence has been reported in 12% to 50% of cases.[ 118]

Treatment options under clinical evaluation

Information about NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following is an example of a national and/or institutional clinical trial that is currently being conducted:

Tumors of Peripheral Nerves

Ectomesenchymoma

Ectomesenchymoma is a rare nerve sheath tumor that mainly occurs in children. It is a biphenotypic soft tissue sarcoma with both mesenchymal and ectodermal components. Elements similar to rhabdomyosarcoma have been identified.

The German Soft Tissue Sarcoma Group (Cooperative Weichteilsarkom Studiengruppe [CWS]) reported on six patients (ages 0.2–13.5 years) registered over 14 years.[ 119][Level of evidence: 3iiA ] The tumors were located in various sites including the extremities, abdomen, and orbit. All six patients were treated with surgery and chemotherapy directed at rhabdomyosarcoma. Two patients received radiation therapy. Three patients recurred with rhabdomyosarcoma features. Although data are scant, it appears that the tumor may respond to chemotherapy.[ 119]

Malignant peripheral nerve sheath tumor

Malignant peripheral nerve sheath tumors account for 5% of soft tissue sarcoma in patients younger than 20 years (refer to Table 1 ).

Risk factors

Malignant peripheral nerve sheath tumor can arise sporadically and in children with type 1 neurofibromatosis (NF1).[ 120]

Molecular features

Inactivating mutations of SUZ12 have been described in these tumors and are absent in neurofibromas.[ 121]

Prognosis

Features associated with a favorable prognosis include the following:[ 120,122-124]

Features associated with an unfavorable prognosis include the following:[ 126]

For patients with localized disease in the MD Anderson Cancer Center study, there was no significant difference in outcome between patients with and without NF1.[ 123] In other studies, it was not clear whether the absence of NF1 is a favorable prognostic factor as it has been associated with both favorable [ 122] and unfavorable outcomes.[ 120,122,124] In the French Sarcoma Group study, NF1 was associated with other adverse prognostic features, but was not an independent predictor of poor outcome.[ 126] The Italian Sarcoma Group reported on outcomes after recurrence in 73 children and adolescents with malignant peripheral nerve sheath tumor.[ 127][Level of evidence: 3iiiA ] The median overall survival after first relapse was 11 months, and the survival rates were 39.2% at 1 year and 15.8% at 5 years. The factors associated with a better prognosis for these patients who relapsed were less initial tumor invasiveness, longer time to relapse, and the achievement of a secondary complete remission (which was related to the feasibility of radical surgery).

Treatment

Treatment options for malignant peripheral nerve sheath tumor include the following:

Complete surgical removal of the tumor, whenever possible, is the mainstay of treatment.

The role of radiation therapy is difficult to assess, but durable local control of known postoperative microscopic residual tumor is not assured after radiation therapy.

Chemotherapy has achieved objective responses in childhood malignant peripheral nerve sheath tumor. A large retrospective analysis of the German and Italian experience with malignant peripheral nerve sheath tumor reported that 65% of measurable tumors had objective responses to ifosfamide-containing chemotherapy regimens, but the analysis did not conclusively demonstrate improved survival for chemotherapy.[ 120] This retrospective analysis also noted a trend toward improved outcome with postoperative radiation therapy.[ 120] A series of 37 young patients with malignant peripheral nerve sheath tumor and NF1 showed that most patients had large invasive tumors that were poorly responsive to chemotherapy; PFS was 19% and 5-year OS was 28%.[ 128]

Treatment options under clinical evaluation

Information about NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following are examples of national and/or institutional clinical trials that are currently being conducted:

Malignant triton tumor

Malignant triton tumors are a variant of malignant peripheral nerve sheath tumors. They occur most often in patients with neurofibromatosis type I and consist of neurogenic and rhabdomyoblastic components. Malignant triton tumors are high-grade malignancies. They usually occur before age 35 years and are very rare in children (case reports only).[ 129]

Malignant triton tumors are not usually responsive to chemotherapy and radiation therapy but have been treated with rhabdomyosarcoma therapy.[ 129][Level of evidence: 3iiiA ] (Refer to the PDQ summary on Childhood Rhabdomyosarcoma Treatment for more information.)

Treatment options under clinical evaluation

Information about NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following is an example of a national and/or institutional clinical trial that is currently being conducted:

Pericytic (Perivascular) Tumors

Myopericytoma

Infantile hemangiopericytoma is a subtype of myopericytoma.

Hemangiopericytoma is a highly vascularized tumor of uncertain origin.

Histology

Histologically, hemangiopericytomas are composed of packed round or fusiform cells that are arranged around a complex vasculature, forming many branch-like structures. Hyalinization is often present. Infantile hemangiopericytomas have similar histology but many are multilobular with vasculature outside the tumor mass.[ 130]

Treatment and outcome

Treatment of infantile hemangiopericytomas includes the following:

In a series of 17 children, the differences in metastatic potential and response to treatment were clearly demonstrated for adult and infantile hemangiopericytomas.[ 131] Eleven children were older than 1 year. Several of these patients had disease in the lymph nodes or lungs. Six patients with stage II or III disease progressed and died. Three patients with stage I disease survived, although one had recurrence in the lungs. Six patients had infantile hemangiopericytoma, most were greater than stage I (5 of 6). All six patients survived and three had good responses to vincristine, actinomycin, and cyclophosphamide. Hemangiopericytoma in children younger than 1 year seems to have a better prognosis than in children older than 1 year.[ 132-134]

Infantile myofibromatosis

This entity is a fibrous tumor of infancy and childhood that most commonly presents in the first 2 years of life.[ 135] The lesion can present as a single subcutaneous nodule (myofibroma) most commonly involving the head and neck region or lesions can affect multiple skin areas, muscle, and bone (myofibromatosis).[ 136-139]

An autosomal dominant form of the disease has been described and it is associated with germline mutations of the PDGFRB gene.[ 140]

Treatment

These lesions have an excellent prognosis and can regress spontaneously.

About one-third of cases with multicentric involvement will also have visceral involvement, and the prognosis for these patients is poor.[ 138,139,141] The use of combination therapy with vincristine/dactinomycin and vinblastine/methotrexate have proven effective in cases of multicentric disease with visceral involvement and in cases in which the disease has progressed and has threatened the life of the patient (e.g., upper airway obstruction).[ 138,139,142]

Tumors of Uncertain Differentiation

Tumors of uncertain differentiation include the following tumor subtypes:

Alveolar soft part sarcoma

Alveolar soft parts sarcomas account for 1.4% of soft tissue sarcomas in patients younger than 20 years (refer to Table 1 ).

Clinical presentation

The median age at presentation is 25 years, and alveolar soft part sarcoma most commonly arises in the extremities but can occur in the oral and maxillofacial region.[ 143-145] Alveolar soft part sarcoma in children can present with evidence of metastatic disease.[ 146]

Molecular features

This tumor of uncertain histogenesis is characterized by a consistent chromosomal translocation t(X;17)(p11.2;q25) that fuses the ASPSCR1 gene with the TFE3 gene.[ 147,148]

Prognosis

Alveolar soft part sarcoma in children may have an indolent course.[ 146] Patients with alveolar soft part sarcoma may relapse several years after a prolonged period of apparent remission.[ 149] Because these tumors are rare, all children with alveolar soft part sarcoma should be considered for enrollment in prospective clinical trials.

In a series of 19 treated patients, one group reported a 5-year OS rate of 80%, a 91% OS rate for patients with localized disease, a 100% OS rate for patients with tumors 5 cm or smaller, and a 31% OS rate for patients with tumors larger than 5 cm.[ 150] In another series of 33 patients, OS was 68% at 5 years from diagnosis and 53% at 10 years from diagnosis. Survival was better for smaller tumors (≤5 cm) and completely resected tumors.[ 151][Level of evidence: 3iiA ] Delayed metastases to the brain and lung are uncommon.[ 143] A retrospective review of children and young adults younger than 30 years (median age, 17 years; range, 1.5–30 years) from four institutions identified 69 patients treated primarily with surgery between 1980 and 2014.[ 152][Level of evidence: 3iiA ] The ASPL-TFE3 translocation was present in all 26 patients tested. There were 19 patients with Intergroup Rhabdomyosarcoma Study (IRS) postsurgical staging group I tumors (28%), 7 patients with IRS group II tumors (10%), 5 patients with IRS group III tumors (7%), and 38 patients with IRS group IV tumors (55%). The 5-year EFS was 80% and the OS was 87% for the 31 patients with localized tumors (IRS postsurgical groups I, II, and III). The 5-year EFS was 7% and the OS was 61% for the 38 patients with metastatic tumors (IRS postsurgical group IV).

Treatment

Treatment options for alveolar soft part sarcoma include the following:

The standard approach is complete resection of the primary lesion.[ 150] If complete excision is not feasible, radiation therapy should be administered. A study from China reported on 18 patients with alveolar soft part sarcoma of the oral and maxillofacial region; 15 patients were younger than 30 years.[ 145][Level of evidence: 3iiDii ] Surgical removal with negative margins was the primary treatment. All patients survived, and only one patient had metastatic disease recurrence.

A series of 51 pediatric patients aged 0 to 21 years with alveolar soft part sarcoma found an OS rate at 10 years of 78% and an EFS rate of about 63%. Patients with localized disease (n = 37) had a 10-year OS of 87%, and the 14 patients with metastases at diagnosis had a 10-year OS of 44%, partly resulting from surgical removal of primary tumor and lung metastases in some patients. Only 3 of 18 patients (17%) with measurable disease had a response to conventional antisarcoma chemotherapy, but two of four patients treated with sunitinib had a partial response.[ 143][Level of evidence: 3iiiA ] There have been sporadic reports of objective responses to interferon-alpha and bevacizumab.[ 143,153,154]

A small retrospective study of nine adult patients with metastatic alveolar soft part sarcoma treated with sunitinib reported partial response in five patients and stable disease in two patients.[ 155][Level of evidence: 3iiiDiv ] In a phase II trial of cediranib, an inhibitor of all three known vascular epidermal growth factor receptors, 15 of 43 adult patients (35%) with metastatic alveolar soft part sarcoma had a partial response.[ 156][Level of evidence: 3iiDiv ]

There have been no open trials for patients with metastatic alveolar soft part sarcoma.

Treatment options under clinical evaluation for alveolar soft part sarcoma

Information about NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following are examples of national and/or institutional clinical trials that are currently being conducted:

Clear cell sarcoma of soft tissue

Clear cell sarcoma (formerly and inappropriately called malignant melanoma of soft parts) is a rare soft tissue sarcoma that typically involves the deep soft tissues of the extremities. It is also called clear cell sarcoma of tendons and aponeuroses. The tumor often affects adolescents and young adults.

Patients who have small, localized tumors with low mitotic rate and intermediate histologic grade fare best.[ 157]

Clinical presentation

The tumor most commonly affects the lower extremity, particularly the foot, heel, and ankle.[ 158,159] It has a high propensity for nodal dissemination, especially metastases to regional lymph nodes (12%–43%).[ 159,160] The tumor typically has an indolent clinical course.

Molecular features

Clear cell sarcoma of soft tissue is characterized by an EWS-ATF1 fusion.[ 161]

Treatment

Treatment options for clear cell sarcoma of soft tissue include the following:

In a series of 28 pediatric patients reported by the Italian and German Soft Tissue Cooperative Studies, the median age at diagnosis was 14 years and the lower extremity was the most common primary site (50%). Surgery with or without radiotherapy is the treatment of choice and offers the best chance for cure. In this series, 12 of 13 patients with completely resected tumors were cured. For patients with more advanced disease the outcome is poor and chemotherapy is rarely effective.[ 162]; [ 163][Level of evidence: 3iiDii ]

Desmoplastic small round cell tumor

Desmoplastic small round cell tumor is a rare primitive sarcoma.

Clinical presentation

Desmoplastic small round cell tumor most frequently involves the abdomen, pelvis, or tissues around the testes, but it may occur in the kidney.[ 164-167] The tumor occurs more commonly in males and may spread to the lungs and elsewhere. Peritoneal and pelvic lesions frequently have widespread peritoneal implants.[ 168]

In a large, single-institution series of 65 patients, a correlation was made between computed tomography (CT) scans in most patients and positron-emission tomography (PET)/CT scans in 11 patients. PET/CT scans had very few false-negative results and detected metastatic sites missed on conventional CT scans.[ 168]

Molecular features

Cytogenetic studies of these tumors have demonstrated the recurrent translocation t(11;22)(p13;q12), which has been characterized as a fusion of the WT1 and EWS genes.[ 167,169] The WT1-EWS fusion confirms the diagnosis of desmoplastic small round cell tumor.

Prognosis

The overall prognosis for desmoplastic small round cell tumor remains extremely poor, with reported rates of death at 90%. Greater than 90% tumor resection either at presentation or after preoperative chemotherapy may be a favorable prognostic factor for OS.[ 170,171]; [ 172][Level of evidence: 3iiiA ]

Treatment

There is no standard approach to the treatment of desmoplastic small round cell tumor.

Treatment options for desmoplastic small round cell tumor include the following:

Complete surgical resections are rare, and the overall prognosis for desmoplastic small round cell tumor remains extremely poor, with reported rates of death at 90%. Treatment may include chemotherapy, surgery, and radiation therapy. Multiagent chemotherapy analogous to that used for sarcomas has been used, as well as total abdominal radiation therapy.[ 164,165,170,173-176]

A single-institution study reported that five of five patients with recurrent desmoplastic small round cell tumor had partial responses to treatment with the combination of vinorelbine, cyclophosphamide, and temsirolimus.[ 177]

The Center for International Blood and Marrow Transplant Research (CIBMTR) analyzed patients with desmoplastic small round cell tumor in their registry who received consolidation with high dose chemotherapy and autologous stem cell reconstitution.[ 178] While this retrospective registry analysis suggested some benefit for this approach, other investigators have abandoned the approach because of excessive toxicity and lack of efficacy.[ 170]

Epithelioid sarcoma

Epithelioid sarcoma is a rare mesenchymal tumor of uncertain histogenesis which displays multilineage differentiation.[ 179]

Clinical presentation

Epithelioid sarcoma commonly presents as a slowly growing firm nodule based in the deep soft tissue; the proximal type predominantly affects adults and involves the axial skeleton and proximal sites. The tumor is highly aggressive and has a propensity for lymph node metastases.

Molecular features

Epithelioid sarcoma is characterized by inactivation of the SMARCB1 gene, which is present in both conventional and proximal types of epithelioid sarcoma.[ 180] This abnormality leads to increased dependence on EZH2 and tumor formation.[ 181]

Treatment

Treatment options for epithelioid sarcoma include the following

Patients should be carefully evaluated for the presence of involved lymph nodes; suspicious lymph nodes should be biopsied. Surgical removal of primary and recurrent tumor(s) is the most effective treatment.[ 182][Level of evidence: 3iiiA ]

In a review of 30 pediatric patients with epithelioid sarcoma (median age at presentation, 12 years), responses to chemotherapy were reported in 40% of patients using sarcoma-based regimens, and 60% of patients were alive at 5 years after initial diagnosis.[ 183] A single-institution retrospective review of 20 patients, including children and adults (median age, 27.3 years), found no difference in the probability of recurrence between patients who received chemotherapy and those who did not receive chemotherapy and suggested that radiation therapy may be useful.[ 182]

Treatment options under clinical evaluation

Information about NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following is an example of a national and/or institutional clinical trial that is currently being conducted:

Extrarenal (extracranial) rhabdoid tumor

Malignant rhabdoid tumors were first described in children with renal tumors in 1981 (refer to the PDQ summary on Wilms Tumor and Other Childhood Kidney Tumors Treatment for more information) and were later found in a variety of extrarenal sites. These tumors are uncommon and highly malignant, especially in children younger than 2 years.

Extrarenal (extracranial) rhabdoid tumors account for 2% of soft tissue sarcoma in patients younger than 20 years (refer to Table 1 ).

Molecular features

The first sizeable series of 26 children with extrarenal extracranial malignant rhabdoid tumor of soft tissues came from patients enrolled on the Intergroup Rhabdomyosarcoma Studies I through III during a review of pathology material. Only five patients (19%) were alive without disease.[ 184] Later, investigation of children with atypical teratoid/rhabdoid tumors of the brain, as well as those with renal and extrarenal malignant rhabdoid tumors, found germline and acquired mutations of the SMARCB1 gene in all 29 tumors tested.[ 185] Rhabdoid tumors may be associated with germline mutations of the SMARCB1 gene and may be inherited from an apparently unaffected parent.[ 186] This observation was extended to 32 malignant rhabdoid tumors at all sites in patients whose mean age at diagnosis was 12 months.[ 187]

Prognosis

In a Surveillance, Epidemiology, and End Results (SEER) study of 229 patients with renal, central nervous system, and extrarenal malignant rhabdoid tumor, patients aged 2 to 18 years, limited extent of tumor, and delivery of radiation therapy were shown to affect the outcome favorably compared with other patients ( P < .002 for each comparison). Site of the primary tumor was not prognostically significant. OS at 5 years was 33%.[ 188]

Treatment

Treatment includes surgical removal when possible, chemotherapy as used for soft tissue sarcomas (but no single regimen is currently accepted as best), and radiation therapy.[ 189][Level of evidence: 3iA ]; [ 190,191][Level of evidence: 3iiiB ]

Responses to alisertib have been documented in four patients with central nervous system (CNS) atypical teratoid/rhabdoid tumors.[ 192] (Refer to the PDQ summary on Childhood Central Nervous System Atypical Teratoid/Rhabdoid Tumor Treatment summary for more information about CNS atypical teratoid/rhabdoid tumors.)

Treatment options under clinical evaluation

Information about NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following is an example of a national and/or institutional clinical trial that is currently being conducted:

Extraskeletal myxoid chondrosarcoma

Extraskeletal myxoid chondrosarcoma is relatively rare among soft tissue sarcomas, representing only 2.3% of all soft tissue sarcoma.[ 193] It has been reported in children and adolescents.[ 194]

Molecular features

Extraskeletal myxoid chondrosarcoma is a multinodular neoplasm. The rounded cells are arranged in cords and strands in a chondroitin sulfate myxoid background. Several cytogenetic abnormalities have been identified (refer to Table 2 ), with the most frequent being the translocation t(9;22)(q22;q12), involving the EWSR1/NR4A3 genes.[ 195]

Prognosis

The tumor has traditionally been considered of low-grade malignant potential.[ 196] However, recent reports from large institutions showed that extraskeletal myxoid chondrosarcoma has significant malignant potential, especially if patients are followed for a long time.[ 197,198] Patients tend to have slow protracted courses. Nodal involvement has been well described. Local recurrence (57%) and metastatic spread to lungs (26%) have been reported.[ 198]

Treatment

Treatment options for extraskeletal myxoid chondrosarcoma include the following:

The therapeutic benefit of chemotherapy has not been established. Aggressive local control and resection of metastases led to OS of 87% at 5 years and 63% at 10 years. Tumors were relatively resistant to radiation therapy.[ 197]

There may be potential genetic targets for small molecules, but these should be studied as part of a clinical trial. In an adult study, six of ten patients who received sunitinib achieved a partial response.[ 199]

Treatment options under clinical evaluation

Information about NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following is an example of a national and/or institutional clinical trial that is currently being conducted:

Neoplasms with perivascular epithelioid cell differentiation (PEComas)

Risk factors and molecular features

Benign PEComas are common in tuberous sclerosis, an autosomal dominant syndrome that also predisposes to renal cell cancer and brain tumors. Tuberous sclerosis is caused by germline inactivation of either TSC1 (9q34) or TSC2 (16p13.3), and the same tumor suppressor genes are inactivated somatically in sporadic PEComas.[ 200] Inactivation of either gene results in stimulation of the mTOR pathway, providing the basis for the treatment of nonsurgically curable PEComas with mTOR inhibitors.[ 201,202] A small proportion of PEComas have TFE3 rearrangements with fusions involving various genes including SFPQ/PSF and RAD51B.[203]

Clinical presentation

PEComas occur in various rare gastrointestinal, pulmonary, gynecologic, and genitourinary sites. Soft tissue, visceral, and gynecologic PEComas are more commonly seen in middle-aged female patients and are usually not associated with the tuberous sclerosis complex.[ 204] The disease course may be indolent.

Prognosis

Most PEComas have a benign clinical course, but malignant behavior has been reported and can be predicted based on the size of the tumor, mitotic rate, and presence of necrosis.[ 205]

Treatment

Treatment options have not been defined. Treatment may include surgery or observation followed by surgery when the tumor is large.[ 206]

Clinical activity with mTOR inhibitors, such as sirolimus, in tumors with evidence of mTORC1 activation and TSC loss has been well documented.[ 207]

Primitive neuroectodermal tumor (PNET)/extraskeletal Ewing tumor

(Refer to the PDQ summary on Ewing Sarcoma Treatment for more information.)

Synovial sarcoma

Synovial sarcoma accounts for 9% of soft tissue sarcomas in patients younger than 20 years (refer to Table 1 ).

Synovial sarcoma is one of the most common nonrhabdomyosarcomatous soft tissue sarcomas in children and adolescents. In a 1973 to 2005 SEER review, 1,268 patients with synovial sarcoma were identified. Approximately 17% of these patients were children and adolescents and the median age at diagnosis was 34 years.[ 208]

Histologic classification

Synovial sarcoma can be subclassified as the following types:

Clinical presentation

The most common tumor location is the extremities, followed by trunk and head and neck.[ 208] Rarely, a synovial sarcoma may arise in the heart or pericardium.[ 209]

The most common site of metastasis is the lung.[ 210,211] The risk of metastases is highly influenced by tumor size; it is estimated that patients with tumors that are larger than 5 cm have a 32-fold risk of developing metastases when compared with other patients.

Diagnostic evaluation

The diagnosis of synovial sarcoma is made by immunohistochemical analysis, ultrastructural findings, and demonstration of the specific chromosomal translocation t(x;18)(p11.2;q11.2). This abnormality is specific for synovial sarcoma and is found in all morphologic subtypes. Synovial sarcoma results in rearrangement of the SYT gene on chromosome 18 with one of the subtypes (1, 2, or 4) of the SSX gene on chromosome X.[ 212,213] It is thought that the SYT/SSX18 transcript promotes epigenetic silencing of key tumor suppressor genes.[ 214]

In one report, reduced INI1 nuclear reactivity on immunohistochemical staining was seen in 49 cases of synovial sarcoma, suggesting that this pattern may help distinguish synovial sarcoma from other histologies.[ 215]

Prognosis

Patients younger than 10 years have more favorable outcomes and clinical features, including extremity primaries, smaller tumors, and localized disease, than do older patients.[ 208,216] A meta-analysis also suggested that response to chemotherapy was correlated with improved survival.[ 217]

The following studies have reported multiple factors associated with unfavorable outcomes:

Survival after relapse is poor (30% at 5 years). Factors associated with outcome after relapse include duration of first remission (> or ≤ 18 months) and lack of a second remission.[ 226]

Treatment

Treatment options for synovial sarcoma include the following:

The COG and the European Pediatric Soft Tissue Sarcoma Study Group reported a combined analysis of 60 patients younger than 21 years with localized synovial sarcoma prospectively assigned to surgery without adjuvant radiation therapy or chemotherapy.[ 227] Enrollment was limited to patients with initial complete resection with histologically free margins, with a grade 2 tumor of any size or a grade 3 tumor 5 cm or smaller. The 3-year EFS was 90% (median follow-up, 5.2 years; range, 1.9–9.1). All eight events were local tumor recurrence; no metastatic recurrences were seen. All patients with recurrent disease were effectively treated with salvage therapy, resulting in 100% OS.

Synovial sarcoma appears to be more sensitive to chemotherapy than many other soft tissue sarcomas, and children with synovial sarcoma seem to have a better prognosis when compared with adults.[ 11,211,222,228-232] The most commonly used regimens for the treatment of synovial sarcoma incorporate ifosfamide and doxorubicin.[ 217,231,233] Response rates to the ifosfamide and doxorubicin regimen are higher than in other nonrhabdomyosarcomatous soft tissue sarcomas.[ 234]

Several studies have reported the following chemotherapy-associated treatment findings:

Treatment options under clinical evaluation

Information about NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following are examples of national and/or institutional clinical trials that are currently being conducted:

Undifferentiated/unclassified sarcoma

Patients with undifferentiated soft tissue sarcoma had been eligible for participation in rhabdomyosarcoma trials coordinated by the Intergroup Rhabdomyosarcoma Study Group and the COG from 1972 to 2006. The rationale was the observation that patients with undifferentiated soft tissue sarcoma had similar sites of disease and outcome as those with alveolar rhabdomyosarcoma. Therapeutic trials for adults with soft tissue sarcoma include patients with undifferentiated soft tissue sarcoma and other histologies, which are treated similarly, using ifosfamide and doxorubicin, and sometimes with other chemotherapy agents, surgery, and radiation therapy.

In the COG ARST0332 (NCT00346164) trial, patients with high-grade undifferentiated sarcoma were treated with an ifosfamide and doxorubicin-based regimen and were treated with rhabdomyosarcoma-directed therapies in previous Intergroup Rhabdomyosarcoma Study Group studies with a 5-year survival estimate for nonmetastatic patients of 72%.[ 240][Level of evidence: 3iiA ] Currently, these patients are eligible for the COG open ARST1321 (NCT02180867) trial for patients with nonrhabdomyosarcomatous soft tissue sarcoma.

Undifferentiated pleomorphic sarcoma/malignant fibrous histiocytoma (high-grade)

At one time, malignant fibrous histiocytoma was the single most common histotype among adults with soft tissue sarcomas. Since it was first recognized in the early 1960s, malignant fibrous histiocytoma has been plagued by controversy in terms of both its histogenesis and its validity as a clinicopathologic entity. The latest WHO classification no longer includes malignant fibrous histiocytoma as a distinct diagnostic category but rather as a subtype of an undifferentiated pleomorphic sarcoma.[ 241]

This entity accounts for 2% to 6% of all childhood soft tissue sarcomas.[ 242] These tumors can arise in previously irradiated sites or as a second malignancy in patients with retinoblastoma.

These tumors occur mainly in the second decade of life. In a series of ten patients, the median age was 10 years and the tumor was most commonly located in the extremities. In this series, all tumors were localized and five of nine (for whom follow-up was available) were alive and in first remission.[ 242] In another series of 17 pediatric patients with malignant fibrous histiocytoma, the median age at diagnosis was 5 years and the extremities were involved in eight cases.[ 243] All patients with metastatic disease died and two patients experienced a clinical response to a doxorubicin-based regimen.

(Refer to the PDQ summary on Osteosarcoma and Malignant Fibrous Histiocytoma of Bone Treatment for more information about the treatment of malignant fibrous histiocytoma of bone.)

Treatment options under clinical evaluation

Information about NCI-supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following is an example of a national and/or institutional clinical trial that is currently being conducted:

Vascular Tumors

Vascular tumors vary from hemangiomas, which are always considered benign, to angiosarcomas, which are highly malignant.[ 244] Vascular tumors include the following tumor subtypes:

Angiosarcoma of the soft tissue

Incidence

Angiosarcoma is a rare (accounting for 2% of sarcomas), aggressive, vascular tumor that can arise in any part of the body, but is more common in the soft tissue. Angiosarcoma has an estimated incidence of 2 cases per 1 million; in the United States, it annually affects approximately 600 people who are typically aged 60 to 70 years.[ 245]

Angiosarcomas are extremely rare in children and it is unclear if the pathophysiology of this tumor is different in the pediatric population. Cases have been reported in neonates and toddlers, with presentation of multiple cutaneous lesions and liver lesions, some of which are GLUT1 positive.[ 246-249] Most angiosarcomas involve the skin and superficial soft tissue, although the liver, spleen, and lung can be affected; bone is rarely affected.

Risk factors

Established risk factors include vinyl chloride exposure, radiation exposure, and chronic lymphedema from any cause, including Stewart-Treves syndrome.[ 250]

Pathology and biology

Angiosarcomas are largely aneuploid tumors. The rare cases of angiosarcoma that arise from benign lesions such as hemangiomas have a distinct pathway that needs to be investigated. MYC amplification is seen in radiation-induced angiosarcoma. KDR-VEGFR2 mutations and FLT4-VEGFR3 amplifications have been seen with a frequency of less than 50%.[ 250]

Histopathologic diagnosis can be very difficult because there can be areas of varied atypia. The common feature is an irregular network of channels in a dissective pattern along dermal collagen bundles. There is varied cellular shape, size, mitosis, endothelial multilayering, and papillary formation. Epithelioid cells can also be present. Necrosis and hemorrhage are common. Tumors stain for factor VIII, CD31, and CD34. Some liver lesions can mimic infantile hemangiomas and have focal GLUT1 positivity. Nomenclature of these liver lesions has been difficult and confusing with use of terminology from 1971 (e.g., type I hemangioendothelioma: infantile hemangioma; type II hemangioendothelioma: low-grade angiosarcoma; type III hemangioendothelioma: high-grade angiosarcoma).[ 247]

Treatment of angiosarcoma of the soft tissue

Treatment options for angiosarcoma of the soft tissue include the following:

Localized disease is cured by aggressive surgery. Complete surgical excision appears to be crucial for angiosarcomas and lymphangiosarcomas despite evidence of tumor shrinkage in some patients who were treated with local or systemic therapy.[ 248,251-253] A review of 222 patients (median age, 62 years; range, age 15–90 years) showed an overall disease-specific survival (DSS) rate of 38% at 5 years. Five-year DSS was 44% in 138 patients with localized, resected tumors but only 16% in 43 patients with metastases at diagnosis.[ 253] Data on liver transplantation for localized angiosarcoma are limited.[ 254][Level of evidence: 3iiA ]

Localized disease, especially cutaneous angiosarcoma, can be treated with radiation therapy. Most of these reported cases are in adults.[ 255]

Multimodal treatment with surgery, systemic chemotherapy, and radiation therapy is used for metastatic disease, although it is rarely curative.[ 256] Disease control is the objective in metastatic angiosarcoma, with published progression-free survival rates between 3 months and 7 months [ 257] and a median overall survival (OS) rate of 14 months to 18 months.[ 258] In both adults and children, 5-year OS rates between 20% and 35% are reported.[ 248,249,259]

In a child diagnosed with angiosarcoma secondary to malignant transformation from infantile hemangioma, response to treatment with bevacizumab, a monoclonal antibody against vascular endothelial growth factor, combined with systemic chemotherapy, has been reported.[ 246,256] A report of eight cases of liver angiosarcoma in children highlighted the misuse of the term hemangioendothelioma and the importance of early diagnosis and treatment of these tumors.[ 260]

Biologic agents that inhibit angiogenesis have shown activity in adults with angiosarcoma.[ 247,259]

Treatment options under clinical evaluation for angiosarcoma of the soft tissue

Information about National Cancer Institute (NCI)–supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following are examples of national and/or institutional clinical trials that are currently being conducted:

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

Epithelioid hemangioendothelioma

Incidence and outcome

This tumor was first described in soft tissue by Weiss and Enzinger in 1982. Epithelioid hemangioendotheliomas can occur at younger ages, but the peak incidence is in the fourth and fifth decades of life. The tumors can have an indolent or very aggressive course, with overall survival of 73% at 5 years. There are case reports of patients with untreated multiple lesions who have a very benign course compared with other patients who have a very aggressive course. Some pathologists have tried to stratify patients to evaluate risks and adjust treatment, but more research is needed.[ 261-267]

The presence of effusions, tumor size larger than 3 cm, and a high mitotic index (>3 mitoses/50 high-power fields) have been associated with unfavorable outcomes.[ 263]

Pathology and biology

A WWTR1-CAMTA1 gene fusion has been found in a large percentage of patients; less commonly, a YAP1-TFE3 gene fusion has been reported.[ 261] These fusions are not directly targetable with current medicines. Monoclonality has been described in multiple liver lesions, suggesting a metastatic process.

Histologically, these lesions are characterized as epithelioid lesions arranged in nests, strands, and trabecular patterns, with infrequent vascular spaces. Features that may be associated with aggressive clinical behavior include cellular atypia, one or more mitoses per 10 high-power fields, an increased proportion of spindled cells, focal necrosis, and metaplastic bone formation.[ 263]

The number of pediatric patients reported in the literature is limited.

Clinical presentation and diagnostic evaluation

Common sites of involvement are liver alone (21%), liver plus lung (18%), lung alone (12%), and bone alone (14%).[ 263,268,269] Clinical presentation depends on site of involvement, as follows:

Treatment of epithelioid hemangioendothelioma

Treatment options for epithelioid hemangioendothelioma include the following:

For indolent cases, observation is warranted. For more aggressive cases, multiple medications have been used, including interferon, thalidomide, sorafenib, pazopanib, and sirolimus.[ 270] The most aggressive cases are treated with angiosarcoma-type chemotherapy. Surgery is used when possible. Liver transplantation has been used with aggressive liver lesions, both with and without metastases.[ 263,271-274]

Treatment options under clinical evaluation for epithelioid hemangioendothelioma

Information about National Cancer Institute (NCI)–supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following are examples of national and/or institutional clinical trials that are currently being conducted:

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

References

1. Ferrari A, Casanova M, Collini P, et al.: Adult-type soft tissue sarcomas in pediatric-age patients: experience at the Istituto Nazionale Tumori in Milan. J Clin Oncol 23 (18): 4021-30, 2005. [PUBMED Abstract]
2. Stanelle EJ, Christison-Lagay ER, Sidebotham EL, et al.: Prognostic factors and survival in pediatric and adolescent liposarcoma. Sarcoma 2012: 870910, 2012. [PUBMED Abstract]
3. Alaggio R, Coffin CM, Weiss SW, et al.: Liposarcomas in young patients: a study of 82 cases occurring in patients younger than 22 years of age. Am J Surg Pathol 33 (5): 645-58, 2009. [PUBMED Abstract]
4. Sreekantaiah C, Karakousis CP, Leong SP, et al.: Cytogenetic findings in liposarcoma correlate with histopathologic subtypes. Cancer 69 (10): 2484-95, 1992. [PUBMED Abstract]
5. Sugiura H, Takahashi M, Katagiri H, et al.: Additional wide resection of malignant soft tissue tumors. Clin Orthop (394): 201-10, 2002. [PUBMED Abstract]
6. Cecchetto G, Guglielmi M, Inserra A, et al.: Primary re-excision: the Italian experience in patients with localized soft-tissue sarcomas. Pediatr Surg Int 17 (7): 532-4, 2001. [PUBMED Abstract]
7. Chui CH, Spunt SL, Liu T, et al.: Is reexcision in pediatric nonrhabdomyosarcoma soft tissue sarcoma necessary after an initial unplanned resection? J Pediatr Surg 37 (10): 1424-9, 2002. [PUBMED Abstract]
8. Bahig H, Roberge D, Bosch W, et al.: Agreement among RTOG sarcoma radiation oncologists in contouring suspicious peritumoral edema for preoperative radiation therapy of soft tissue sarcoma of the extremity. Int J Radiat Oncol Biol Phys 86 (2): 298-303, 2013. [PUBMED Abstract]
9. Baldini EH, Wang D, Haas RL, et al.: Treatment Guidelines for Preoperative Radiation Therapy for Retroperitoneal Sarcoma: Preliminary Consensus of an International Expert Panel. Int J Radiat Oncol Biol Phys 92 (3): 602-12, 2015. [PUBMED Abstract]
10. Ferrari A, Casanova M, Spreafico F, et al.: Childhood liposarcoma: a single-institutional twenty-year experience. Pediatr Hematol Oncol 16 (5): 415-21, 1999 Sep-Oct. [PUBMED Abstract]
11. Cecchetto G, Alaggio R, Dall'Igna P, et al.: Localized unresectable non-rhabdo soft tissue sarcomas of the extremities in pediatric age: results from the Italian studies. Cancer 104 (9): 2006-12, 2005. [PUBMED Abstract]
12. Huh WW, Yuen C, Munsell M, et al.: Liposarcoma in children and young adults: a multi-institutional experience. Pediatr Blood Cancer 57 (7): 1142-6, 2011. [PUBMED Abstract]
13. Gronchi A, Bui BN, Bonvalot S, et al.: Phase II clinical trial of neoadjuvant trabectedin in patients with advanced localized myxoid liposarcoma. Ann Oncol 23 (3): 771-6, 2012. [PUBMED Abstract]
14. Demetri GD, von Mehren M, Jones RL, et al.: Efficacy and Safety of Trabectedin or Dacarbazine for Metastatic Liposarcoma or Leiomyosarcoma After Failure of Conventional Chemotherapy: Results of a Phase III Randomized Multicenter Clinical Trial. J Clin Oncol 34 (8): 786-93, 2016. [PUBMED Abstract]
15. Baruchel S, Pappo A, Krailo M, et al.: A phase 2 trial of trabectedin in children with recurrent rhabdomyosarcoma, Ewing sarcoma and non-rhabdomyosarcoma soft tissue sarcomas: a report from the Children's Oncology Group. Eur J Cancer 48 (4): 579-85, 2012. [PUBMED Abstract]
16. Wang L, Motoi T, Khanin R, et al.: Identification of a novel, recurrent HEY1-NCOA2 fusion in mesenchymal chondrosarcoma based on a genome-wide screen of exon-level expression data. Genes Chromosomes Cancer 51 (2): 127-39, 2012. [PUBMED Abstract]
17. Nyquist KB, Panagopoulos I, Thorsen J, et al.: Whole-transcriptome sequencing identifies novel IRF2BP2-CDX1 fusion gene brought about by translocation t(1;5)(q42;q32) in mesenchymal chondrosarcoma. PLoS One 7 (11): e49705, 2012. [PUBMED Abstract]
18. Frezza AM, Cesari M, Baumhoer D, et al.: Mesenchymal chondrosarcoma: prognostic factors and outcome in 113 patients. A European Musculoskeletal Oncology Society study. Eur J Cancer 51 (3): 374-81, 2015. [PUBMED Abstract]
19. Dantonello TM, Int-Veen C, Leuschner I, et al.: Mesenchymal chondrosarcoma of soft tissues and bone in children, adolescents, and young adults: experiences of the CWS and COSS study groups. Cancer 112 (11): 2424-31, 2008. [PUBMED Abstract]
20. Bishop MW, Somerville JM, Bahrami A, et al.: Mesenchymal Chondrosarcoma in Children and Young Adults: A Single Institution Retrospective Review. Sarcoma 2015: 608279, 2015. [PUBMED Abstract]
21. Wodowski K, Hill DA, Pappo AS, et al.: A chemosensitive pediatric extraosseous osteosarcoma: case report and review of the literature. J Pediatr Hematol Oncol 25 (1): 73-7, 2003. [PUBMED Abstract]
22. Sordillo PP, Hajdu SI, Magill GB, et al.: Extraosseous osteogenic sarcoma. A review of 48 patients. Cancer 51 (4): 727-34, 1983. [PUBMED Abstract]
23. Nieuwenhuis MH, Casparie M, Mathus-Vliegen LM, et al.: A nation-wide study comparing sporadic and familial adenomatous polyposis-related desmoid-type fibromatoses. Int J Cancer 129 (1): 256-61, 2011. [PUBMED Abstract]
24. Rossato M, Rigotti M, Grazia M, et al.: Congenital hypertrophy of the retinal pigment epithelium (CHRPE) and familial adenomatous polyposis (FAP). Acta Ophthalmol Scand 74 (4): 338-42, 1996. [PUBMED Abstract]
25. Baker RH, Heinemann MH, Miller HH, et al.: Hyperpigmented lesions of the retinal pigment epithelium in familial adenomatous polyposis. Am J Med Genet 31 (2): 427-35, 1988. [PUBMED Abstract]
26. Kattentidt Mouravieva AA, Geurts-Giele IR, de Krijger RR, et al.: Identification of Familial Adenomatous Polyposis carriers among children with desmoid tumours. Eur J Cancer 48 (12): 1867-74, 2012. [PUBMED Abstract]
27. Wang WL, Nero C, Pappo A, et al.: CTNNB1 genotyping and APC screening in pediatric desmoid tumors: a proposed algorithm. Pediatr Dev Pathol 15 (5): 361-7, 2012 Sep-Oct. [PUBMED Abstract]
28. Lewis JJ, Boland PJ, Leung DH, et al.: The enigma of desmoid tumors. Ann Surg 229 (6): 866-72; discussion 872-3, 1999. [PUBMED Abstract]
29. Lazar AJ, Tuvin D, Hajibashi S, et al.: Specific mutations in the beta-catenin gene (CTNNB1) correlate with local recurrence in sporadic desmoid tumors. Am J Pathol 173 (5): 1518-27, 2008. [PUBMED Abstract]
30. Faulkner LB, Hajdu SI, Kher U, et al.: Pediatric desmoid tumor: retrospective analysis of 63 cases. J Clin Oncol 13 (11): 2813-8, 1995. [PUBMED Abstract]
31. Merchant NB, Lewis JJ, Woodruff JM, et al.: Extremity and trunk desmoid tumors: a multifactorial analysis of outcome. Cancer 86 (10): 2045-52, 1999. [PUBMED Abstract]
32. Honeyman JN, Theilen TM, Knowles MA, et al.: Desmoid fibromatosis in children and adolescents: a conservative approach to management. J Pediatr Surg 48 (1): 62-6, 2013. [PUBMED Abstract]
33. Bonvalot S, Ternès N, Fiore M, et al.: Spontaneous regression of primary abdominal wall desmoid tumors: more common than previously thought. Ann Surg Oncol 20 (13): 4096-102, 2013. [PUBMED Abstract]
34. Bonvalot S, Eldweny H, Haddad V, et al.: Extra-abdominal primary fibromatosis: Aggressive management could be avoided in a subgroup of patients. Eur J Surg Oncol 34 (4): 462-8, 2008. [PUBMED Abstract]
35. Merchant TE, Nguyen D, Walter AW, et al.: Long-term results with radiation therapy for pediatric desmoid tumors. Int J Radiat Oncol Biol Phys 47 (5): 1267-71, 2000. [PUBMED Abstract]
36. Zelefsky MJ, Harrison LB, Shiu MH, et al.: Combined surgical resection and iridium 192 implantation for locally advanced and recurrent desmoid tumors. Cancer 67 (2): 380-4, 1991. [PUBMED Abstract]
37. Weiss AJ, Lackman RD: Low-dose chemotherapy of desmoid tumors. Cancer 64 (6): 1192-4, 1989. [PUBMED Abstract]
38. Klein WA, Miller HH, Anderson M, et al.: The use of indomethacin, sulindac, and tamoxifen for the treatment of desmoid tumors associated with familial polyposis. Cancer 60 (12): 2863-8, 1987. [PUBMED Abstract]
39. Soto-Miranda MA, Sandoval JA, Rao B, et al.: Surgical treatment of pediatric desmoid tumors. A 12-year, single-center experience. Ann Surg Oncol 20 (11): 3384-90, 2013. [PUBMED Abstract]
40. Skapek SX, Ferguson WS, Granowetter L, et al.: Vinblastine and methotrexate for desmoid fibromatosis in children: results of a Pediatric Oncology Group Phase II Trial. J Clin Oncol 25 (5): 501-6, 2007. [PUBMED Abstract]
41. Gandhi MM, Nathan PC, Weitzman S, et al.: Successful treatment of life-threatening generalized infantile myofibromatosis using low-dose chemotherapy. J Pediatr Hematol Oncol 25 (9): 750-4, 2003. [PUBMED Abstract]
42. Gega M, Yanagi H, Yoshikawa R, et al.: Successful chemotherapeutic modality of doxorubicin plus dacarbazine for the treatment of desmoid tumors in association with familial adenomatous polyposis. J Clin Oncol 24 (1): 102-5, 2006. [PUBMED Abstract]
43. Constantinidou A, Jones RL, Scurr M, et al.: Pegylated liposomal doxorubicin, an effective, well-tolerated treatment for refractory aggressive fibromatosis. Eur J Cancer 45 (17): 2930-4, 2009. [PUBMED Abstract]
44. Ananth P, Werger A, Voss S, et al.: Liposomal doxorubicin: Effective treatment for pediatric desmoid fibromatosis. Pediatr Blood Cancer 64 (7): , 2017. [PUBMED Abstract]
45. Gounder MM, Lefkowitz RA, Keohan ML, et al.: Activity of Sorafenib against desmoid tumor/deep fibromatosis. Clin Cancer Res 17 (12): 4082-90, 2011. [PUBMED Abstract]
46. Heinrich MC, McArthur GA, Demetri GD, et al.: Clinical and molecular studies of the effect of imatinib on advanced aggressive fibromatosis (desmoid tumor). J Clin Oncol 24 (7): 1195-203, 2006. [PUBMED Abstract]
47. Chugh R, Wathen JK, Patel SR, et al.: Efficacy of imatinib in aggressive fibromatosis: Results of a phase II multicenter Sarcoma Alliance for Research through Collaboration (SARC) trial. Clin Cancer Res 16 (19): 4884-91, 2010. [PUBMED Abstract]
48. Agresta L, Kim H, Turpin BK, et al.: Pazopanib therapy for desmoid tumors in adolescent and young adult patients. Pediatr Blood Cancer : , 2018. [PUBMED Abstract]
49. Shang H, Braggio D, Lee YJ, et al.: Targeting the Notch pathway: A potential therapeutic approach for desmoid tumors. Cancer 121 (22): 4088-96, 2015. [PUBMED Abstract]
50. Messersmith WA, Shapiro GI, Cleary JM, et al.: A Phase I, dose-finding study in patients with advanced solid malignancies of the oral γ-secretase inhibitor PF-03084014. Clin Cancer Res 21 (1): 60-7, 2015. [PUBMED Abstract]
51. Bisogno G, Tagarelli A, Stramare R, et al.: Hydroxyurea treatment can avoid the need for aggressive surgery in pediatric fibromatosis. J Pediatr Hematol Oncol 35 (4): e171-3, 2013. [PUBMED Abstract]
52. Meazza C, Casanova M, Trecate G, et al.: Objective response to hydroxyurea in a patient with heavily pre-treated aggressive fibromatosis. Pediatr Blood Cancer 55 (3): 587-8, 2010. [PUBMED Abstract]
53. Balamuth NJ, Womer RB: Successful treatment of fibromatosis with hydroxyurea: Analysis of 20 pediatric cases. [Abstract] The Connective Tissue Oncology Society (CTOS) 14th Annual Meeting, 13–15 November 2008, London, United Kingdom A-34852, 2008. Also available online . Last accessed April 02, 2018.
54. Meazza C, Bisogno G, Gronchi A, et al.: Aggressive fibromatosis in children and adolescents: the Italian experience. Cancer 116 (1): 233-40, 2010. [PUBMED Abstract]
55. Hansmann A, Adolph C, Vogel T, et al.: High-dose tamoxifen and sulindac as first-line treatment for desmoid tumors. Cancer 100 (3): 612-20, 2004. [PUBMED Abstract]
56. Skapek SX, Anderson JR, Hill DA, et al.: Safety and efficacy of high-dose tamoxifen and sulindac for desmoid tumor in children: results of a Children's Oncology Group (COG) phase II study. Pediatr Blood Cancer 60 (7): 1108-12, 2013. [PUBMED Abstract]
57. Rutenberg MS, Indelicato DJ, Knapik JA, et al.: External-beam radiotherapy for pediatric and young adult desmoid tumors. Pediatr Blood Cancer 57 (3): 435-42, 2011. [PUBMED Abstract]
58. Buckley PG, Mantripragada KK, Benetkiewicz M, et al.: A full-coverage, high-resolution human chromosome 22 genomic microarray for clinical and research applications. Hum Mol Genet 11 (25): 3221-9, 2002. [PUBMED Abstract]
59. Valdivielso-Ramos M, Torrelo A, Campos M, et al.: Pediatric dermatofibrosarcoma protuberans in Madrid, Spain: multi-institutional outcomes. Pediatr Dermatol 31 (6): 676-82, 2014 Nov-Dec. [PUBMED Abstract]
60. Gooskens SL, Oranje AP, van Adrichem LN, et al.: Imatinib mesylate for children with dermatofibrosarcoma protuberans (DFSP). Pediatr Blood Cancer 55 (2): 369-73, 2010. [PUBMED Abstract]
61. Rubio GA, Alvarado A, Gerth DJ, et al.: Incidence and Outcomes of Dermatofibrosarcoma Protuberans in the US Pediatric Population. J Craniofac Surg 28 (1): 182-184, 2017. [PUBMED Abstract]
62. Meguerditchian AN, Wang J, Lema B, et al.: Wide excision or Mohs micrographic surgery for the treatment of primary dermatofibrosarcoma protuberans. Am J Clin Oncol 33 (3): 300-3, 2010. [PUBMED Abstract]
63. Dagan R, Morris CG, Zlotecki RA, et al.: Radiotherapy in the treatment of dermatofibrosarcoma protuberans. Am J Clin Oncol 28 (6): 537-9, 2005. [PUBMED Abstract]
64. Sun LM, Wang CJ, Huang CC, et al.: Dermatofibrosarcoma protuberans: treatment results of 35 cases. Radiother Oncol 57 (2): 175-81, 2000. [PUBMED Abstract]
65. Price VE, Fletcher JA, Zielenska M, et al.: Imatinib mesylate: an attractive alternative in young children with large, surgically challenging dermatofibrosarcoma protuberans. Pediatr Blood Cancer 44 (5): 511-5, 2005. [PUBMED Abstract]
66. McArthur GA, Demetri GD, van Oosterom A, et al.: Molecular and clinical analysis of locally advanced dermatofibrosarcoma protuberans treated with imatinib: Imatinib Target Exploration Consortium Study B2225. J Clin Oncol 23 (4): 866-73, 2005. [PUBMED Abstract]
67. Rutkowski P, Van Glabbeke M, Rankin CJ, et al.: Imatinib mesylate in advanced dermatofibrosarcoma protuberans: pooled analysis of two phase II clinical trials. J Clin Oncol 28 (10): 1772-9, 2010. [PUBMED Abstract]
68. Miller SJ, Alam M, Andersen JS, et al.: Dermatofibrosarcoma protuberans. J Natl Compr Canc Netw 10 (3): 312-8, 2012. [PUBMED Abstract]
69. Kao YC, Fletcher CDM, Alaggio R, et al.: Recurrent BRAF Gene Fusions in a Subset of Pediatric Spindle Cell Sarcomas: Expanding the Genetic Spectrum of Tumors With Overlapping Features With Infantile Fibrosarcoma. Am J Surg Pathol 42 (1): 28-38, 2018. [PUBMED Abstract]
70. Sulkowski JP, Raval MV, Browne M: Margin status and multimodal therapy in infantile fibrosarcoma. Pediatr Surg Int 29 (8): 771-6, 2013. [PUBMED Abstract]
71. Orbach D, Rey A, Cecchetto G, et al.: Infantile fibrosarcoma: management based on the European experience. J Clin Oncol 28 (2): 318-23, 2010. [PUBMED Abstract]
72. Orbach D, Brennan B, De Paoli A, et al.: Conservative strategy in infantile fibrosarcoma is possible: The European paediatric Soft tissue sarcoma Study Group experience. Eur J Cancer 57: 1-9, 2016. [PUBMED Abstract]
73. Spunt SL, Million L, Coffin C: The nonrhabdomyosarcoma soft tissue sarcoma. In: Pizzo PA, Poplack DG, eds.: Principles and Practice of Pediatric Oncology. 7th ed. Philadelphia, Pa: Lippincott Williams and Wilkins, 2015, pp 827-54.
74. Loh ML, Ahn P, Perez-Atayde AR, et al.: Treatment of infantile fibrosarcoma with chemotherapy and surgery: results from the Dana-Farber Cancer Institute and Children's Hospital, Boston. J Pediatr Hematol Oncol 24 (9): 722-6, 2002. [PUBMED Abstract]
75. Akyüz C, Küpeli S, Varan A, et al.: Infantile fibrosarcoma: retrospective analysis of eleven patients. Tumori 97 (2): 166-9, 2011 Mar-Apr. [PUBMED Abstract]
76. Gallego S, Pericas N, Barber I, et al.: Infantile fibrosarcoma of the retroperitoneum: a site of unfavorable prognosis? Pediatr Hematol Oncol 28 (5): 451-3, 2011. [PUBMED Abstract]
77. Parida L, Fernandez-Pineda I, Uffman JK, et al.: Clinical management of infantile fibrosarcoma: a retrospective single-institution review. Pediatr Surg Int 29 (7): 703-8, 2013. [PUBMED Abstract]
78. Mody RJ, Wu YM, Lonigro RJ, et al.: Integrative Clinical Sequencing in the Management of Refractory or Relapsed Cancer in Youth. JAMA 314 (9): 913-25, 2015. [PUBMED Abstract]
79. Wong V, Pavlick D, Brennan T, et al.: Evaluation of a Congenital Infantile Fibrosarcoma by Comprehensive Genomic Profiling Reveals an LMNA-NTRK1 Gene Fusion Responsive to Crizotinib. J Natl Cancer Inst 108 (1): , 2016. [PUBMED Abstract]
80. Nagasubramanian R, Wei J, Gordon P, et al.: Infantile Fibrosarcoma With NTRK3-ETV6 Fusion Successfully Treated With the Tropomyosin-Related Kinase Inhibitor LOXO-101. Pediatr Blood Cancer 63 (8): 1468-70, 2016. [PUBMED Abstract]
81. Yanagisawa R, Noguchi M, Fujita K, et al.: Preoperative Treatment With Pazopanib in a Case of Chemotherapy-Resistant Infantile Fibrosarcoma. Pediatr Blood Cancer 63 (2): 348-51, 2016. [PUBMED Abstract]
82. Madden NP, Spicer RD, Allibone EB, et al.: Spontaneous regression of neonatal fibrosarcoma. Br J Cancer Suppl 18: S72-5, 1992. [PUBMED Abstract]
83. Kovach SJ, Fischer AC, Katzman PJ, et al.: Inflammatory myofibroblastic tumors. J Surg Oncol 94 (5): 385-91, 2006. [PUBMED Abstract]
84. Brodlie M, Barwick SC, Wood KM, et al.: Inflammatory myofibroblastic tumours of the respiratory tract: paediatric case series with varying clinical presentations. J Laryngol Otol 125 (8): 865-8, 2011. [PUBMED Abstract]
85. Xiao Y, Zhou S, Ma C, et al.: Radiological and histopathological features of hepatic inflammatory myofibroblastic tumour: analysis of 10 cases. Clin Radiol 68 (11): 1114-20, 2013. [PUBMED Abstract]
86. Karnak I, Senocak ME, Ciftci AO, et al.: Inflammatory myofibroblastic tumor in children: diagnosis and treatment. J Pediatr Surg 36 (6): 908-12, 2001. [PUBMED Abstract]
87. Collin M, Charles A, Barker A, et al.: Inflammatory myofibroblastic tumour of the bladder in children: a review. J Pediatr Urol 11 (5): 239-45, 2015. [PUBMED Abstract]
88. Coffin CM, Hornick JL, Fletcher CD: Inflammatory myofibroblastic tumor: comparison of clinicopathologic, histologic, and immunohistochemical features including ALK expression in atypical and aggressive cases. Am J Surg Pathol 31 (4): 509-20, 2007. [PUBMED Abstract]
89. Lovly CM, Gupta A, Lipson D, et al.: Inflammatory myofibroblastic tumors harbor multiple potentially actionable kinase fusions. Cancer Discov 4 (8): 889-95, 2014. [PUBMED Abstract]
90. Devaney KO, Lafeir DJ, Triantafyllou A, et al.: Inflammatory myofibroblastic tumors of the head and neck: evaluation of clinicopathologic and prognostic features. Eur Arch Otorhinolaryngol 269 (12): 2461-5, 2012. [PUBMED Abstract]
91. Mehta B, Mascarenhas L, Zhou S, et al.: Inflammatory myofibroblastic tumors in childhood. Pediatr Hematol Oncol 30 (7): 640-5, 2013. [PUBMED Abstract]
92. Favini F, Resti AG, Collini P, et al.: Inflammatory myofibroblastic tumor of the conjunctiva: response to chemotherapy with low-dose methotrexate and vinorelbine. Pediatr Blood Cancer 54 (3): 483-5, 2010. [PUBMED Abstract]
93. Doski JJ, Priebe CJ Jr, Driessnack M, et al.: Corticosteroids in the management of unresected plasma cell granuloma (inflammatory pseudotumor) of the lung. J Pediatr Surg 26 (9): 1064-6, 1991. [PUBMED Abstract]
94. Diop B, Konate I, Ka S, et al.: Mesenteric myofibroblastic tumor: NSAID therapy after incomplete resection. J Visc Surg 148 (4): e311-4, 2011. [PUBMED Abstract]
95. Dalton BG, Thomas PG, Sharp NE, et al.: Inflammatory myofibroblastic tumors in children. J Pediatr Surg 51 (4): 541-4, 2016. [PUBMED Abstract]
96. Butrynski JE, D'Adamo DR, Hornick JL, et al.: Crizotinib in ALK-rearranged inflammatory myofibroblastic tumor. N Engl J Med 363 (18): 1727-33, 2010. [PUBMED Abstract]
97. Mossé YP, Lim MS, Voss SD, et al.: Safety and activity of crizotinib for paediatric patients with refractory solid tumours or anaplastic large-cell lymphoma: a Children's Oncology Group phase 1 consortium study. Lancet Oncol 14 (6): 472-80, 2013. [PUBMED Abstract]
98. Gaudichon J, Jeanne-Pasquier C, Deparis M, et al.: Complete and Repeated Response of a Metastatic ALK-rearranged Inflammatory Myofibroblastic Tumor to Crizotinib in a Teenage Girl. J Pediatr Hematol Oncol 38 (4): 308-11, 2016. [PUBMED Abstract]
99. Nishio M, Murakami H, Horiike A, et al.: Phase I Study of Ceritinib (LDK378) in Japanese Patients with Advanced, Anaplastic Lymphoma Kinase-Rearranged Non-Small-Cell Lung Cancer or Other Tumors. J Thorac Oncol 10 (7): 1058-66, 2015. [PUBMED Abstract]
100. Mossé YP, Voss SD, Lim MS, et al.: Targeting ALK With Crizotinib in Pediatric Anaplastic Large Cell Lymphoma and Inflammatory Myofibroblastic Tumor: A Children's Oncology Group Study. J Clin Oncol 35 (28): 3215-3221, 2017. [PUBMED Abstract]
101. Evans HL: Low-grade fibromyxoid sarcoma: a clinicopathologic study of 33 cases with long-term follow-up. Am J Surg Pathol 35 (10): 1450-62, 2011. [PUBMED Abstract]
102. Guillou L, Benhattar J, Gengler C, et al.: Translocation-positive low-grade fibromyxoid sarcoma: clinicopathologic and molecular analysis of a series expanding the morphologic spectrum and suggesting potential relationship to sclerosing epithelioid fibrosarcoma: a study from the French Sarcoma Group. Am J Surg Pathol 31 (9): 1387-402, 2007. [PUBMED Abstract]
103. O'Sullivan MJ, Sirgi KE, Dehner LP: Low-grade fibrosarcoma (hyalinizing spindle cell tumor with giant rosettes) with pulmonary metastases at presentation: case report and review of the literature. Int J Surg Pathol 10 (3): 211-6, 2002. [PUBMED Abstract]
104. Folpe AL, Lane KL, Paull G, et al.: Low-grade fibromyxoid sarcoma and hyalinizing spindle cell tumor with giant rosettes: a clinicopathologic study of 73 cases supporting their identity and assessing the impact of high-grade areas. Am J Surg Pathol 24 (10): 1353-60, 2000. [PUBMED Abstract]
105. Sargar K, Kao SC, Spunt SL, et al.: MRI and CT of Low-Grade Fibromyxoid Sarcoma in Children: A Report From Children's Oncology Group Study ARST0332. AJR Am J Roentgenol 205 (2): 414-20, 2015. [PUBMED Abstract]
106. Maretty-Nielsen K, Baerentzen S, Keller J, et al.: Low-Grade Fibromyxoid Sarcoma: Incidence, Treatment Strategy of Metastases, and Clinical Significance of the FUS Gene. Sarcoma 2013: 256280, 2013. [PUBMED Abstract]
107. Prieto-Granada C, Zhang L, Chen HW, et al.: A genetic dichotomy between pure sclerosing epithelioid fibrosarcoma (SEF) and hybrid SEF/low-grade fibromyxoid sarcoma: a pathologic and molecular study of 18 cases. Genes Chromosomes Cancer 54 (1): 28-38, 2015. [PUBMED Abstract]
108. Pollock BH, Jenson HB, Leach CT, et al.: Risk factors for pediatric human immunodeficiency virus-related malignancy. JAMA 289 (18): 2393-9, 2003. [PUBMED Abstract]
109. Kleinerman RA, Tucker MA, Abramson DH, et al.: Risk of soft tissue sarcomas by individual subtype in survivors of hereditary retinoblastoma. J Natl Cancer Inst 99 (1): 24-31, 2007. [PUBMED Abstract]
110. Samuels BL, Chawla S, Patel S, et al.: Clinical outcomes and safety with trabectedin therapy in patients with advanced soft tissue sarcomas following failure of prior chemotherapy: results of a worldwide expanded access program study. Ann Oncol 24 (6): 1703-9, 2013. [PUBMED Abstract]
111. Enzinger FM, Zhang RY: Plexiform fibrohistiocytic tumor presenting in children and young adults. An analysis of 65 cases. Am J Surg Pathol 12 (11): 818-26, 1988. [PUBMED Abstract]
112. Black J, Coffin CM, Dehner LP: Fibrohistiocytic tumors and related neoplasms in children and adolescents. Pediatr Dev Pathol 15 (1 Suppl): 181-210, 2012. [PUBMED Abstract]
113. Moosavi C, Jha P, Fanburg-Smith JC: An update on plexiform fibrohistiocytic tumor and addition of 66 new cases from the Armed Forces Institute of Pathology, in honor of Franz M. Enzinger, MD. Ann Diagn Pathol 11 (5): 313-9, 2007. [PUBMED Abstract]
114. Billings SD, Folpe AL: Cutaneous and subcutaneous fibrohistiocytic tumors of intermediate malignancy: an update. Am J Dermatopathol 26 (2): 141-55, 2004. [PUBMED Abstract]
115. Remstein ED, Arndt CA, Nascimento AG: Plexiform fibrohistiocytic tumor: clinicopathologic analysis of 22 cases. Am J Surg Pathol 23 (6): 662-70, 1999. [PUBMED Abstract]
116. Salomao DR, Nascimento AG: Plexiform fibrohistiocytic tumor with systemic metastases: a case report. Am J Surg Pathol 21 (4): 469-76, 1997. [PUBMED Abstract]
117. Redlich GC, Montgomery KD, Allgood GA, et al.: Plexiform fibrohistiocytic tumor with a clonal cytogenetic anomaly. Cancer Genet Cytogenet 108 (2): 141-3, 1999. [PUBMED Abstract]
118. Luzar B, Calonje E: Cutaneous fibrohistiocytic tumours - an update. Histopathology 56 (1): 148-65, 2010. [PUBMED Abstract]
119. Dantonello TM, Leuschner I, Vokuhl C, et al.: Malignant ectomesenchymoma in children and adolescents: report from the Cooperative Weichteilsarkom Studiengruppe (CWS). Pediatr Blood Cancer 60 (2): 224-9, 2013. [PUBMED Abstract]
120. Carli M, Ferrari A, Mattke A, et al.: Pediatric malignant peripheral nerve sheath tumor: the Italian and German soft tissue sarcoma cooperative group. J Clin Oncol 23 (33): 8422-30, 2005. [PUBMED Abstract]
121. Zhang M, Wang Y, Jones S, et al.: Somatic mutations of SUZ12 in malignant peripheral nerve sheath tumors. Nat Genet 46 (11): 1170-2, 2014. [PUBMED Abstract]
122. Hagel C, Zils U, Peiper M, et al.: Histopathology and clinical outcome of NF1-associated vs. sporadic malignant peripheral nerve sheath tumors. J Neurooncol 82 (2): 187-92, 2007. [PUBMED Abstract]
123. Zou C, Smith KD, Liu J, et al.: Clinical, pathological, and molecular variables predictive of malignant peripheral nerve sheath tumor outcome. Ann Surg 249 (6): 1014-22, 2009. [PUBMED Abstract]
124. Okada K, Hasegawa T, Tajino T, et al.: Clinical relevance of pathological grades of malignant peripheral nerve sheath tumor: a multi-institution TMTS study of 56 cases in Northern Japan. Ann Surg Oncol 14 (2): 597-604, 2007. [PUBMED Abstract]
125. Amirian ES, Goodman JC, New P, et al.: Pediatric and adult malignant peripheral nerve sheath tumors: an analysis of data from the surveillance, epidemiology, and end results program. J Neurooncol 116 (3): 609-16, 2014. [PUBMED Abstract]
126. Valentin T, Le Cesne A, Ray-Coquard I, et al.: Management and prognosis of malignant peripheral nerve sheath tumors: The experience of the French Sarcoma Group (GSF-GETO). Eur J Cancer 56: 77-84, 2016. [PUBMED Abstract]
127. Bergamaschi L, Bisogno G, Manzitti C, et al.: Salvage rates and prognostic factors after relapse in children and adolescents with malignant peripheral nerve sheath tumors. Pediatr Blood Cancer 65 (2): , 2018. [PUBMED Abstract]
128. Ferrari A, Bisogno G, Macaluso A, et al.: Soft-tissue sarcomas in children and adolescents with neurofibromatosis type 1. Cancer 109 (7): 1406-12, 2007. [PUBMED Abstract]
129. Okur FV, Oguz A, Karadeniz C, et al.: Malignant triton tumor of the pelvis in a 2-year-old boy. J Pediatr Hematol Oncol 28 (3): 173-6, 2006. [PUBMED Abstract]
130. Weiss SW, Goldblum JR: Enzinger and Weiss's Soft Tissue Tumors. 4th ed. St. Louis, Mo: Mosby, 2001.
131. Fernandez-Pineda I, Parida L, Jenkins JJ, et al.: Childhood hemangiopericytoma: review of St Jude Children's Research Hospital. J Pediatr Hematol Oncol 33 (5): 356-9, 2011. [PUBMED Abstract]
132. Rodriguez-Galindo C, Ramsey K, Jenkins JJ, et al.: Hemangiopericytoma in children and infants. Cancer 88 (1): 198-204, 2000. [PUBMED Abstract]
133. Ferrari A, Casanova M, Bisogno G, et al.: Hemangiopericytoma in pediatric ages: a report from the Italian and German Soft Tissue Sarcoma Cooperative Group. Cancer 92 (10): 2692-8, 2001. [PUBMED Abstract]
134. Bien E, Stachowicz-Stencel T, Godzinski J, et al.: Retrospective multi-institutional study on hemangiopericytoma in Polish children. Pediatr Int 51 (1): 19-24, 2009. [PUBMED Abstract]
135. Wiswell TE, Davis J, Cunningham BE, et al.: Infantile myofibromatosis: the most common fibrous tumor of infancy. J Pediatr Surg 23 (4): 315-8, 1988. [PUBMED Abstract]
136. Chung EB, Enzinger FM: Infantile myofibromatosis. Cancer 48 (8): 1807-18, 1981. [PUBMED Abstract]
137. Modi N: Congenital generalised fibromatosis. Arch Dis Child 57 (11): 881-2, 1982. [PUBMED Abstract]
138. Levine E, Fréneaux P, Schleiermacher G, et al.: Risk-adapted therapy for infantile myofibromatosis in children. Pediatr Blood Cancer 59 (1): 115-20, 2012. [PUBMED Abstract]
139. Larralde M, Hoffner MV, Boggio P, et al.: Infantile myofibromatosis: report of nine patients. Pediatr Dermatol 27 (1): 29-33, 2010 Jan-Feb. [PUBMED Abstract]
140. Cheung YH, Gayden T, Campeau PM, et al.: A recurrent PDGFRB mutation causes familial infantile myofibromatosis. Am J Hum Genet 92 (6): 996-1000, 2013. [PUBMED Abstract]
141. Gopal M, Chahal G, Al-Rifai Z, et al.: Infantile myofibromatosis. Pediatr Surg Int 24 (3): 287-91, 2008. [PUBMED Abstract]
142. Weaver MS, Navid F, Huppmann A, et al.: Vincristine and Dactinomycin in Infantile Myofibromatosis With a Review of Treatment Options. J Pediatr Hematol Oncol 37 (3): 237-41, 2015. [PUBMED Abstract]
143. Orbach D, Brennan B, Casanova M, et al.: Paediatric and adolescent alveolar soft part sarcoma: A joint series from European cooperative groups. Pediatr Blood Cancer 60 (11): 1826-32, 2013. [PUBMED Abstract]
144. Ferrari A, Sultan I, Huang TT, et al.: Soft tissue sarcoma across the age spectrum: a population-based study from the Surveillance Epidemiology and End Results database. Pediatr Blood Cancer 57 (6): 943-9, 2011. [PUBMED Abstract]
145. Wang HW, Qin XJ, Yang WJ, et al.: Alveolar soft part sarcoma of the oral and maxillofacial region: clinical analysis in a series of 18 patients. Oral Surg Oral Med Oral Pathol Oral Radiol 119 (4): 396-401, 2015. [PUBMED Abstract]
146. Kayton ML, Meyers P, Wexler LH, et al.: Clinical presentation, treatment, and outcome of alveolar soft part sarcoma in children, adolescents, and young adults. J Pediatr Surg 41 (1): 187-93, 2006. [PUBMED Abstract]
147. Ladanyi M, Lui MY, Antonescu CR, et al.: The der(17)t(X;17)(p11;q25) of human alveolar soft part sarcoma fuses the TFE3 transcription factor gene to ASPL, a novel gene at 17q25. Oncogene 20 (1): 48-57, 2001. [PUBMED Abstract]
148. Williams A, Bartle G, Sumathi VP, et al.: Detection of ASPL/TFE3 fusion transcripts and the TFE3 antigen in formalin-fixed, paraffin-embedded tissue in a series of 18 cases of alveolar soft part sarcoma: useful diagnostic tools in cases with unusual histological features. Virchows Arch 458 (3): 291-300, 2011. [PUBMED Abstract]
149. Lieberman PH, Brennan MF, Kimmel M, et al.: Alveolar soft-part sarcoma. A clinico-pathologic study of half a century. Cancer 63 (1): 1-13, 1989. [PUBMED Abstract]
150. Casanova M, Ferrari A, Bisogno G, et al.: Alveolar soft part sarcoma in children and adolescents: A report from the Soft-Tissue Sarcoma Italian Cooperative Group. Ann Oncol 11 (11): 1445-9, 2000. [PUBMED Abstract]
151. Pennacchioli E, Fiore M, Collini P, et al.: Alveolar soft part sarcoma: clinical presentation, treatment, and outcome in a series of 33 patients at a single institution. Ann Surg Oncol 17 (12): 3229-33, 2010. [PUBMED Abstract]
152. Flores RJ, Harrison DJ, Federman NC, et al.: Alveolar soft part sarcoma in children and young adults: A report of 69 cases. Pediatr Blood Cancer : , 2018. [PUBMED Abstract]
153. Roozendaal KJ, de Valk B, ten Velden JJ, et al.: Alveolar soft-part sarcoma responding to interferon alpha-2b. Br J Cancer 89 (2): 243-5, 2003. [PUBMED Abstract]
154. Conde N, Cruz O, Albert A, et al.: Antiangiogenic treatment as a pre-operative management of alveolar soft-part sarcoma. Pediatr Blood Cancer 57 (6): 1071-3, 2011. [PUBMED Abstract]
155. Stacchiotti S, Negri T, Zaffaroni N, et al.: Sunitinib in advanced alveolar soft part sarcoma: evidence of a direct antitumor effect. Ann Oncol 22 (7): 1682-90, 2011. [PUBMED Abstract]
156. Kummar S, Allen D, Monks A, et al.: Cediranib for metastatic alveolar soft part sarcoma. J Clin Oncol 31 (18): 2296-302, 2013. [PUBMED Abstract]
157. Coindre JM, Hostein I, Terrier P, et al.: Diagnosis of clear cell sarcoma by real-time reverse transcriptase-polymerase chain reaction analysis of paraffin embedded tissues: clinicopathologic and molecular analysis of 44 patients from the French sarcoma group. Cancer 107 (5): 1055-64, 2006. [PUBMED Abstract]
158. Meis-Kindblom JM: Clear cell sarcoma of tendons and aponeuroses: a historical perspective and tribute to the man behind the entity. Adv Anat Pathol 13 (6): 286-92, 2006. [PUBMED Abstract]
159. Dim DC, Cooley LD, Miranda RN: Clear cell sarcoma of tendons and aponeuroses: a review. Arch Pathol Lab Med 131 (1): 152-6, 2007. [PUBMED Abstract]
160. Blazer DG 3rd, Lazar AJ, Xing Y, et al.: Clinical outcomes of molecularly confirmed clear cell sarcoma from a single institution and in comparison with data from the Surveillance, Epidemiology, and End Results registry. Cancer 115 (13): 2971-9, 2009. [PUBMED Abstract]
161. Fujimura Y, Siddique H, Lee L, et al.: EWS-ATF-1 chimeric protein in soft tissue clear cell sarcoma associates with CREB-binding protein and interferes with p53-mediated trans-activation function. Oncogene 20 (46): 6653-9, 2001. [PUBMED Abstract]
162. Ferrari A, Casanova M, Bisogno G, et al.: Clear cell sarcoma of tendons and aponeuroses in pediatric patients: a report from the Italian and German Soft Tissue Sarcoma Cooperative Group. Cancer 94 (12): 3269-76, 2002. [PUBMED Abstract]
163. Karita M, Tsuchiya H, Yamamoto N, et al.: Caffeine-potentiated chemotherapy for clear cell sarcoma: a report of five cases. Int J Clin Oncol 18 (1): 33-7, 2013. [PUBMED Abstract]
164. Leuschner I, Radig K, Harms D: Desmoplastic small round cell tumor. Semin Diagn Pathol 13 (3): 204-12, 1996. [PUBMED Abstract]
165. Kushner BH, LaQuaglia MP, Wollner N, et al.: Desmoplastic small round-cell tumor: prolonged progression-free survival with aggressive multimodality therapy. J Clin Oncol 14 (5): 1526-31, 1996. [PUBMED Abstract]
166. Saab R, Khoury JD, Krasin M, et al.: Desmoplastic small round cell tumor in childhood: the St. Jude Children's Research Hospital experience. Pediatr Blood Cancer 49 (3): 274-9, 2007. [PUBMED Abstract]
167. Wang LL, Perlman EJ, Vujanic GM, et al.: Desmoplastic small round cell tumor of the kidney in childhood. Am J Surg Pathol 31 (4): 576-84, 2007. [PUBMED Abstract]
168. Arora VC, Price AP, Fleming S, et al.: Characteristic imaging features of desmoplastic small round cell tumour. Pediatr Radiol 43 (1): 93-102, 2013. [PUBMED Abstract]
169. Gerald WL, Ladanyi M, de Alava E, et al.: Clinical, pathologic, and molecular spectrum of tumors associated with t(11;22)(p13;q12): desmoplastic small round-cell tumor and its variants. J Clin Oncol 16 (9): 3028-36, 1998. [PUBMED Abstract]
170. Lal DR, Su WT, Wolden SL, et al.: Results of multimodal treatment for desmoplastic small round cell tumors. J Pediatr Surg 40 (1): 251-5, 2005. [PUBMED Abstract]
171. Philippe-Chomette P, Kabbara N, Andre N, et al.: Desmoplastic small round cell tumors with EWS-WT1 fusion transcript in children and young adults. Pediatr Blood Cancer 58 (6): 891-7, 2012. [PUBMED Abstract]
172. Sedig L, Geiger J, Mody R, et al.: Paratesticular desmoplastic small round cell tumors: A case report and review of the literature. Pediatr Blood Cancer 64 (12): , 2017. [PUBMED Abstract]
173. Schwarz RE, Gerald WL, Kushner BH, et al.: Desmoplastic small round cell tumors: prognostic indicators and results of surgical management. Ann Surg Oncol 5 (5): 416-22, 1998 Jul-Aug. [PUBMED Abstract]
174. Goodman KA, Wolden SL, La Quaglia MP, et al.: Whole abdominopelvic radiotherapy for desmoplastic small round-cell tumor. Int J Radiat Oncol Biol Phys 54 (1): 170-6, 2002. [PUBMED Abstract]
175. Osborne EM, Briere TM, Hayes-Jordan A, et al.: Survival and toxicity following sequential multimodality treatment including whole abdominopelvic radiotherapy for patients with desmoplastic small round cell tumor. Radiother Oncol 119 (1): 40-4, 2016. [PUBMED Abstract]
176. Atallah V, Honore C, Orbach D, et al.: Role of Adjuvant Radiation Therapy After Surgery for Abdominal Desmoplastic Small Round Cell Tumors. Int J Radiat Oncol Biol Phys 95 (4): 1244-53, 2016. [PUBMED Abstract]
177. Tarek N, Hayes-Jordan A, Salvador L, et al.: Recurrent desmoplastic small round cell tumor responding to an mTOR inhibitor containing regimen. Pediatr Blood Cancer 65 (1): , 2018. [PUBMED Abstract]
178. Cook RJ, Wang Z, Arora M, et al.: Clinical outcomes of patients with desmoplastic small round cell tumor of the peritoneum undergoing autologous HCT: a CIBMTR retrospective analysis. Bone Marrow Transplant 47 (11): 1455-8, 2012. [PUBMED Abstract]
179. Chbani L, Guillou L, Terrier P, et al.: Epithelioid sarcoma: a clinicopathologic and immunohistochemical analysis of 106 cases from the French sarcoma group. Am J Clin Pathol 131 (2): 222-7, 2009. [PUBMED Abstract]
180. Hornick JL, Dal Cin P, Fletcher CD: Loss of INI1 expression is characteristic of both conventional and proximal-type epithelioid sarcoma. Am J Surg Pathol 33 (4): 542-50, 2009. [PUBMED Abstract]
181. Knutson SK, Warholic NM, Wigle TJ, et al.: Durable tumor regression in genetically altered malignant rhabdoid tumors by inhibition of methyltransferase EZH2. Proc Natl Acad Sci U S A 110 (19): 7922-7, 2013. [PUBMED Abstract]
182. Guzzetta AA, Montgomery EA, Lyu H, et al.: Epithelioid sarcoma: one institution's experience with a rare sarcoma. J Surg Res 177 (1): 116-22, 2012. [PUBMED Abstract]
183. Casanova M, Ferrari A, Collini P, et al.: Epithelioid sarcoma in children and adolescents: a report from the Italian Soft Tissue Sarcoma Committee. Cancer 106 (3): 708-17, 2006. [PUBMED Abstract]
184. Kodet R, Newton WA Jr, Sachs N, et al.: Rhabdoid tumors of soft tissues: a clinicopathologic study of 26 cases enrolled on the Intergroup Rhabdomyosarcoma Study. Hum Pathol 22 (7): 674-84, 1991. [PUBMED Abstract]
185. Biegel JA, Zhou JY, Rorke LB, et al.: Germ-line and acquired mutations of INI1 in atypical teratoid and rhabdoid tumors. Cancer Res 59 (1): 74-9, 1999. [PUBMED Abstract]
186. Eaton KW, Tooke LS, Wainwright LM, et al.: Spectrum of SMARCB1/INI1 mutations in familial and sporadic rhabdoid tumors. Pediatr Blood Cancer 56 (1): 7-15, 2011. [PUBMED Abstract]
187. Lee RS, Stewart C, Carter SL, et al.: A remarkably simple genome underlies highly malignant pediatric rhabdoid cancers. J Clin Invest 122 (8): 2983-8, 2012. [PUBMED Abstract]
188. Sultan I, Qaddoumi I, Rodríguez-Galindo C, et al.: Age, stage, and radiotherapy, but not primary tumor site, affects the outcome of patients with malignant rhabdoid tumors. Pediatr Blood Cancer 54 (1): 35-40, 2010. [PUBMED Abstract]
189. Puri DR, Meyers PA, Kraus DH, et al.: Radiotherapy in the multimodal treatment of extrarenal extracranial malignant rhabdoid tumors. Pediatr Blood Cancer 50 (1): 167-9, 2008. [PUBMED Abstract]
190. Madigan CE, Armenian SH, Malogolowkin MH, et al.: Extracranial malignant rhabdoid tumors in childhood: the Childrens Hospital Los Angeles experience. Cancer 110 (9): 2061-6, 2007. [PUBMED Abstract]
191. Bourdeaut F, Fréneaux P, Thuille B, et al.: Extra-renal non-cerebral rhabdoid tumours. Pediatr Blood Cancer 51 (3): 363-8, 2008. [PUBMED Abstract]
192. Wetmore C, Boyett J, Li S, et al.: Alisertib is active as single agent in recurrent atypical teratoid rhabdoid tumors in 4 children. Neuro Oncol 17 (6): 882-8, 2015. [PUBMED Abstract]
193. Tsuneyoshi M, Enjoji M, Iwasaki H, et al.: Extraskeletal myxoid chondrosarcoma--a clinicopathologic and electron microscopic study. Acta Pathol Jpn 31 (3): 439-47, 1981. [PUBMED Abstract]
194. Hachitanda Y, Tsuneyoshi M, Daimaru Y, et al.: Extraskeletal myxoid chondrosarcoma in young children. Cancer 61 (12): 2521-6, 1988. [PUBMED Abstract]
195. Hisaoka M, Ishida T, Imamura T, et al.: TFG is a novel fusion partner of NOR1 in extraskeletal myxoid chondrosarcoma. Genes Chromosomes Cancer 40 (4): 325-8, 2004. [PUBMED Abstract]
196. Enzinger FM, Shiraki M: Extraskeletal myxoid chondrosarcoma. An analysis of 34 cases. Hum Pathol 3 (3): 421-35, 1972. [PUBMED Abstract]
197. McGrory JE, Rock MG, Nascimento AG, et al.: Extraskeletal myxoid chondrosarcoma. Clin Orthop Relat Res (382): 185-90, 2001. [PUBMED Abstract]
198. Drilon AD, Popat S, Bhuchar G, et al.: Extraskeletal myxoid chondrosarcoma: a retrospective review from 2 referral centers emphasizing long-term outcomes with surgery and chemotherapy. Cancer 113 (12): 3364-71, 2008. [PUBMED Abstract]
199. Stacchiotti S, Pantaleo MA, Astolfi A, et al.: Activity of sunitinib in extraskeletal myxoid chondrosarcoma. Eur J Cancer 50 (9): 1657-64, 2014. [PUBMED Abstract]
200. Martignoni G, Pea M, Reghellin D, et al.: Molecular pathology of lymphangioleiomyomatosis and other perivascular epithelioid cell tumors. Arch Pathol Lab Med 134 (1): 33-40, 2010. [PUBMED Abstract]
201. Bissler JJ, McCormack FX, Young LR, et al.: Sirolimus for angiomyolipoma in tuberous sclerosis complex or lymphangioleiomyomatosis. N Engl J Med 358 (2): 140-51, 2008. [PUBMED Abstract]
202. Davies DM, Johnson SR, Tattersfield AE, et al.: Sirolimus therapy in tuberous sclerosis or sporadic lymphangioleiomyomatosis. N Engl J Med 358 (2): 200-3, 2008. [PUBMED Abstract]
203. Agaram NP, Sung YS, Zhang L, et al.: Dichotomy of Genetic Abnormalities in PEComas With Therapeutic Implications. Am J Surg Pathol 39 (6): 813-25, 2015. [PUBMED Abstract]
204. Folpe A, Inwards C, eds.: Bone and Soft Tissue Pathology: A Volume in the Foundations in Diagnostic Pathology. Philadelphia, Pa: WB Saunders Co, 2010.
205. Armah HB, Parwani AV: Perivascular epithelioid cell tumor. Arch Pathol Lab Med 133 (4): 648-54, 2009. [PUBMED Abstract]
206. Alaggio R, Cecchetto G, Martignoni G, et al.: Malignant perivascular epithelioid cell tumor in children: description of a case and review of the literature. J Pediatr Surg 47 (6): e31-40, 2012. [PUBMED Abstract]
207. Wagner AJ, Malinowska-Kolodziej I, Morgan JA, et al.: Clinical activity of mTOR inhibition with sirolimus in malignant perivascular epithelioid cell tumors: targeting the pathogenic activation of mTORC1 in tumors. J Clin Oncol 28 (5): 835-40, 2010. [PUBMED Abstract]
208. Sultan I, Rodriguez-Galindo C, Saab R, et al.: Comparing children and adults with synovial sarcoma in the Surveillance, Epidemiology, and End Results program, 1983 to 2005: an analysis of 1268 patients. Cancer 115 (15): 3537-47, 2009. [PUBMED Abstract]
209. Wang JG, Li NN: Primary cardiac synovial sarcoma. Ann Thorac Surg 95 (6): 2202-9, 2013. [PUBMED Abstract]
210. Pappo AS, Fontanesi J, Luo X, et al.: Synovial sarcoma in children and adolescents: the St Jude Children's Research Hospital experience. J Clin Oncol 12 (11): 2360-6, 1994. [PUBMED Abstract]
211. Ferrari A, De Salvo GL, Oberlin O, et al.: Synovial sarcoma in children and adolescents: a critical reappraisal of staging investigations in relation to the rate of metastatic involvement at diagnosis. Eur J Cancer 48 (9): 1370-5, 2012. [PUBMED Abstract]
212. van de Rijn M, Barr FG, Collins MH, et al.: Absence of SYT-SSX fusion products in soft tissue tumors other than synovial sarcoma. Am J Clin Pathol 112 (1): 43-9, 1999. [PUBMED Abstract]
213. Krsková L, Sumerauer D, Stejskalová E, et al.: A novel variant of SYT-SSX1 fusion gene in a case of spindle cell synovial sarcoma. Diagn Mol Pathol 16 (3): 179-83, 2007. [PUBMED Abstract]
214. Su L, Sampaio AV, Jones KB, et al.: Deconstruction of the SS18-SSX fusion oncoprotein complex: insights into disease etiology and therapeutics. Cancer Cell 21 (3): 333-47, 2012. [PUBMED Abstract]
215. Arnold MA, Arnold CA, Li G, et al.: A unique pattern of INI1 immunohistochemistry distinguishes synovial sarcoma from its histologic mimics. Hum Pathol 44 (5): 881-7, 2013. [PUBMED Abstract]
216. Vlenterie M, Ho VK, Kaal SE, et al.: Age as an independent prognostic factor for survival of localised synovial sarcoma patients. Br J Cancer 113 (11): 1602-6, 2015. [PUBMED Abstract]
217. Okcu MF, Munsell M, Treuner J, et al.: Synovial sarcoma of childhood and adolescence: a multicenter, multivariate analysis of outcome. J Clin Oncol 21 (8): 1602-11, 2003. [PUBMED Abstract]
218. Brecht IB, Ferrari A, Int-Veen C, et al.: Grossly-resected synovial sarcoma treated by the German and Italian Pediatric Soft Tissue Sarcoma Cooperative Groups: discussion on the role of adjuvant therapies. Pediatr Blood Cancer 46 (1): 11-7, 2006. [PUBMED Abstract]
219. Stanelle EJ, Christison-Lagay ER, Healey JH, et al.: Pediatric and adolescent synovial sarcoma: multivariate analysis of prognostic factors and survival outcomes. Ann Surg Oncol 20 (1): 73-9, 2013. [PUBMED Abstract]
220. Trassard M, Le Doussal V, Hacène K, et al.: Prognostic factors in localized primary synovial sarcoma: a multicenter study of 128 adult patients. J Clin Oncol 19 (2): 525-34, 2001. [PUBMED Abstract]
221. Guillou L, Benhattar J, Bonichon F, et al.: Histologic grade, but not SYT-SSX fusion type, is an important prognostic factor in patients with synovial sarcoma: a multicenter, retrospective analysis. J Clin Oncol 22 (20): 4040-50, 2004. [PUBMED Abstract]
222. Ferrari A, Gronchi A, Casanova M, et al.: Synovial sarcoma: a retrospective analysis of 271 patients of all ages treated at a single institution. Cancer 101 (3): 627-34, 2004. [PUBMED Abstract]
223. Lagarde P, Przybyl J, Brulard C, et al.: Chromosome instability accounts for reverse metastatic outcomes of pediatric and adult synovial sarcomas. J Clin Oncol 31 (5): 608-15, 2013. [PUBMED Abstract]
224. Stegmaier S, Leuschner I, Poremba C, et al.: The prognostic impact of SYT-SSX fusion type and histological grade in pediatric patients with synovial sarcoma treated according to the CWS (Cooperative Weichteilsarkom Studie) trials. Pediatr Blood Cancer 64 (1): 89-95, 2017. [PUBMED Abstract]
225. Scheer M, Dantonello T, Hallmen E, et al.: Primary Metastatic Synovial Sarcoma: Experience of the CWS Study Group. Pediatr Blood Cancer 63 (7): 1198-206, 2016. [PUBMED Abstract]
226. Ferrari A, De Salvo GL, Dall'Igna P, et al.: Salvage rates and prognostic factors after relapse in children and adolescents with initially localised synovial sarcoma. Eur J Cancer 48 (18): 3448-55, 2012. [PUBMED Abstract]
227. Ferrari A, Chi YY, De Salvo GL, et al.: Surgery alone is sufficient therapy for children and adolescents with low-risk synovial sarcoma: A joint analysis from the European paediatric soft tissue sarcoma Study Group and the Children's Oncology Group. Eur J Cancer 78: 1-6, 2017. [PUBMED Abstract]
228. McGrory JE, Pritchard DJ, Arndt CA, et al.: Nonrhabdomyosarcoma soft tissue sarcomas in children. The Mayo Clinic experience. Clin Orthop (374): 247-58, 2000. [PUBMED Abstract]
229. Van Glabbeke M, van Oosterom AT, Oosterhuis JW, et al.: Prognostic factors for the outcome of chemotherapy in advanced soft tissue sarcoma: an analysis of 2,185 patients treated with anthracycline-containing first-line regimens--a European Organization for Research and Treatment of Cancer Soft Tissue and Bone Sarcoma Group Study. J Clin Oncol 17 (1): 150-7, 1999. [PUBMED Abstract]
230. Koscielniak E, Harms D, Henze G, et al.: Results of treatment for soft tissue sarcoma in childhood and adolescence: a final report of the German Cooperative Soft Tissue Sarcoma Study CWS-86. J Clin Oncol 17 (12): 3706-19, 1999. [PUBMED Abstract]
231. Pappo AS, Devidas M, Jenkins J, et al.: Phase II trial of neoadjuvant vincristine, ifosfamide, and doxorubicin with granulocyte colony-stimulating factor support in children and adolescents with advanced-stage nonrhabdomyosarcomatous soft tissue sarcomas: a Pediatric Oncology Group Study. J Clin Oncol 23 (18): 4031-8, 2005. [PUBMED Abstract]
232. Pappo AS, Rao BN, Jenkins JJ, et al.: Metastatic nonrhabdomyosarcomatous soft-tissue sarcomas in children and adolescents: the St. Jude Children's Research Hospital experience. Med Pediatr Oncol 33 (2): 76-82, 1999. [PUBMED Abstract]
233. Brennan B, Stevens M, Kelsey A, et al.: Synovial sarcoma in childhood and adolescence: a retrospective series of 77 patients registered by the Children's Cancer and Leukaemia Group between 1991 and 2006. Pediatr Blood Cancer 55 (1): 85-90, 2010. [PUBMED Abstract]
234. Ferrari A, Miceli R, Rey A, et al.: Non-metastatic unresected paediatric non-rhabdomyosarcoma soft tissue sarcomas: results of a pooled analysis from United States and European groups. Eur J Cancer 47 (5): 724-31, 2011. [PUBMED Abstract]
235. Raney RB: Synovial sarcoma in young people: background, prognostic factors, and therapeutic questions. J Pediatr Hematol Oncol 27 (4): 207-11, 2005. [PUBMED Abstract]
236. Orbach D, Mc Dowell H, Rey A, et al.: Sparing strategy does not compromise prognosis in pediatric localized synovial sarcoma: experience of the International Society of Pediatric Oncology, Malignant Mesenchymal Tumors (SIOP-MMT) Working Group. Pediatr Blood Cancer 57 (7): 1130-6, 2011. [PUBMED Abstract]
237. Ladenstein R, Treuner J, Koscielniak E, et al.: Synovial sarcoma of childhood and adolescence. Report of the German CWS-81 study. Cancer 71 (11): 3647-55, 1993. [PUBMED Abstract]
238. Venkatramani R, Anderson JR, Million L, et al.: Risk-based treatment for synovial sarcoma in patients under 30 years of age: Children’s Oncology Group study ARST0332. [Abstract] J Clin Oncol 33 (15 Suppl): A-10012, 2015. Also available online . Last accessed April 02, 2018.
239. Ferrari A, De Salvo GL, Brennan B, et al.: Synovial sarcoma in children and adolescents: the European Pediatric Soft Tissue Sarcoma Study Group prospective trial (EpSSG NRSTS 2005). Ann Oncol 26 (3): 567-72, 2015. [PUBMED Abstract]
240. Spunt SL, Million L, Anderson JR, et al.: Risk-based treatment for nonrhabdomyosarcoma soft tissue sarcomas (NRSTS) in patients under 30 years of age: Children’s Oncology Group study ARST0332. [Abstract] J Clin Oncol 32 (Suppl 15): A-10008, 2014. Also available online . Last accessed April 02, 2018.
241. Randall RL, Albritton KH, Ferney BJ, et al.: Malignant fibrous histiocytoma of soft tissue: an abandoned diagnosis. Am J Orthop 33 (12): 602-8, 2004. [PUBMED Abstract]
242. Alaggio R, Collini P, Randall RL, et al.: Undifferentiated high-grade pleomorphic sarcomas in children: a clinicopathologic study of 10 cases and review of literature. Pediatr Dev Pathol 13 (3): 209-17, 2010 May-Jun. [PUBMED Abstract]
243. Daw NC, Billups CA, Pappo AS, et al.: Malignant fibrous histiocytoma and other fibrohistiocytic tumors in pediatric patients: the St. Jude Children's Research Hospital experience. Cancer 97 (11): 2839-47, 2003. [PUBMED Abstract]
244. Coffin CM, Dehner LP: Vascular tumors in children and adolescents: a clinicopathologic study of 228 tumors in 222 patients. Pathol Annu 28 Pt 1: 97-120, 1993. [PUBMED Abstract]
245. Cioffi A, Reichert S, Antonescu CR, et al.: Angiosarcomas and other sarcomas of endothelial origin. Hematol Oncol Clin North Am 27 (5): 975-88, 2013. [PUBMED Abstract]
246. Jeng MR, Fuh B, Blatt J, et al.: Malignant transformation of infantile hemangioma to angiosarcoma: response to chemotherapy with bevacizumab. Pediatr Blood Cancer 61 (11): 2115-7, 2014. [PUBMED Abstract]
247. Dehner LP, Ishak KG: Vascular tumors of the liver in infants and children. A study of 30 cases and review of the literature. Arch Pathol 92 (2): 101-11, 1971. [PUBMED Abstract]
248. Ferrari A, Casanova M, Bisogno G, et al.: Malignant vascular tumors in children and adolescents: a report from the Italian and German Soft Tissue Sarcoma Cooperative Group. Med Pediatr Oncol 39 (2): 109-14, 2002. [PUBMED Abstract]
249. Deyrup AT, Miettinen M, North PE, et al.: Pediatric cutaneous angiosarcomas: a clinicopathologic study of 10 cases. Am J Surg Pathol 35 (1): 70-5, 2011. [PUBMED Abstract]
250. Elliott P, Kleinschmidt I: Angiosarcoma of the liver in Great Britain in proximity to vinyl chloride sites. Occup Environ Med 54 (1): 14-8, 1997. [PUBMED Abstract]
251. Lezama-del Valle P, Gerald WL, Tsai J, et al.: Malignant vascular tumors in young patients. Cancer 83 (8): 1634-9, 1998. [PUBMED Abstract]
252. Fata F, O'Reilly E, Ilson D, et al.: Paclitaxel in the treatment of patients with angiosarcoma of the scalp or face. Cancer 86 (10): 2034-7, 1999. [PUBMED Abstract]
253. Lahat G, Dhuka AR, Hallevi H, et al.: Angiosarcoma: clinical and molecular insights. Ann Surg 251 (6): 1098-106, 2010. [PUBMED Abstract]
254. Orlando G, Adam R, Mirza D, et al.: Hepatic hemangiosarcoma: an absolute contraindication to liver transplantation--the European Liver Transplant Registry experience. Transplantation 95 (6): 872-7, 2013. [PUBMED Abstract]
255. Sanada T, Nakayama H, Irisawa R, et al.: Clinical outcome and dose volume evaluation in patients who undergo brachytherapy for angiosarcoma of the scalp and face. Mol Clin Oncol 6 (3): 334-340, 2017. [PUBMED Abstract]
256. Dickson MA, D'Adamo DR, Keohan ML, et al.: Phase II Trial of Gemcitabine and Docetaxel with Bevacizumab in Soft Tissue Sarcoma. Sarcoma 2015: 532478, 2015. [PUBMED Abstract]
257. North PE, Waner M, Mizeracki A, et al.: A unique microvascular phenotype shared by juvenile hemangiomas and human placenta. Arch Dermatol 137 (5): 559-70, 2001. [PUBMED Abstract]
258. Boye E, Yu Y, Paranya G, et al.: Clonality and altered behavior of endothelial cells from hemangiomas. J Clin Invest 107 (6): 745-52, 2001. [PUBMED Abstract]
259. Ravi V, Patel S: Vascular sarcomas. Curr Oncol Rep 15 (4): 347-55, 2013. [PUBMED Abstract]
260. Grassia KL, Peterman CM, Iacobas I, et al.: Clinical case series of pediatric hepatic angiosarcoma. Pediatr Blood Cancer 64 (11): , 2017. [PUBMED Abstract]
261. Mehrabi A, Kashfi A, Fonouni H, et al.: Primary malignant hepatic epithelioid hemangioendothelioma: a comprehensive review of the literature with emphasis on the surgical therapy. Cancer 107 (9): 2108-21, 2006. [PUBMED Abstract]
262. Haro A, Saitoh G, Tamiya S, et al.: Four-year natural clinical course of pulmonary epithelioid hemangioendothelioma without therapy. Thorac Cancer 6 (4): 544-7, 2015. [PUBMED Abstract]
263. Sardaro A, Bardoscia L, Petruzzelli MF, et al.: Epithelioid hemangioendothelioma: an overview and update on a rare vascular tumor. Oncol Rev 8 (2): 259, 2014. [PUBMED Abstract]
264. Dong K, Wang XX, Feng JL, et al.: Pathological characteristics of liver biopsies in eight patients with hepatic epithelioid hemangioendothelioma. Int J Clin Exp Pathol 8 (9): 11015-23, 2015. [PUBMED Abstract]
265. Adams DM, Hammill A: Other vascular tumors. Semin Pediatr Surg 23 (4): 173-7, 2014. [PUBMED Abstract]
266. Xiao Y, Wang C, Song Y, et al.: Primary epithelioid hemangioendothelioma of the kidney: the first case report in a child and literature review. Urology 82 (4): 925-7, 2013. [PUBMED Abstract]
267. Reich S, Ringe H, Uhlenberg B, et al.: Epithelioid hemangioendothelioma of the lung presenting with pneumonia and heart rhythm disturbances in a teenage girl. J Pediatr Hematol Oncol 32 (4): 274-6, 2010. [PUBMED Abstract]
268. Daller JA, Bueno J, Gutierrez J, et al.: Hepatic hemangioendothelioma: clinical experience and management strategy. J Pediatr Surg 34 (1): 98-105; discussion 105-6, 1999. [PUBMED Abstract]
269. Ackermann O, Fabre M, Franchi S, et al.: Widening spectrum of liver angiosarcoma in children. J Pediatr Gastroenterol Nutr 53 (6): 615-9, 2011. [PUBMED Abstract]
270. Stacchiotti S, Provenzano S, Dagrada G, et al.: Sirolimus in Advanced Epithelioid Hemangioendothelioma: A Retrospective Case-Series Analysis from the Italian Rare Cancer Network Database. Ann Surg Oncol 23 (9): 2735-44, 2016. [PUBMED Abstract]
271. Semenisty V, Naroditsky I, Keidar Z, et al.: Pazopanib for metastatic pulmonary epithelioid hemangioendothelioma-a suitable treatment option: case report and review of anti-angiogenic treatment options. BMC Cancer 15: 402, 2015. [PUBMED Abstract]
272. Raheja A, Suri A, Singh S, et al.: Multimodality management of a giant skull base hemangioendothelioma of the sphenopetroclival region. J Clin Neurosci 22 (9): 1495-8, 2015. [PUBMED Abstract]
273. Ahmad N, Adams DM, Wang J, et al.: Hepatic epithelioid hemangioendothelioma in a patient with hemochromatosis. J Natl Compr Canc Netw 12 (9): 1203-7, 2014. [PUBMED Abstract]
274. Otte JB, Zimmerman A: The role of liver transplantation for pediatric epithelioid hemangioendothelioma. Pediatr Transplant 14 (3): 295-7, 2010. [PUBMED Abstract]

Standard treatment options for metastatic childhood soft tissue sarcoma include the following:

For treatment options, refer to the individual tumor type sections of the summary.

The prognosis for children with metastatic soft tissue sarcomas is poor,[ 1-6] and these children should receive combined treatment with chemotherapy, radiation therapy, and surgical resection of pulmonary metastases. In a prospective randomized trial, chemotherapy with vincristine, dactinomycin, doxorubicin, and cyclophosphamide, with or without dacarbazine, led to tumor responses in one-third of patients with unresectable or metastatic disease. The estimated 4-year survival rate, however, was poor, with fewer than one-third of children surviving.[ 6-8]

Pulmonary Metastases

Generally, children with isolated pulmonary metastases should be considered for a surgical procedure in an attempt to resect all gross disease.[ 9] For patients with multiple or recurrent pulmonary metastases, additional surgical procedures can be performed if the morbidity is deemed acceptable. In a retrospective review, patients with synovial sarcoma and pulmonary metastases for whom it was possible to completely resect all metastatic lung lesions had better survival than did patients for whom it was not possible to achieve complete resections.[ 9][Level of evidence: 3iiiA ] Formal segmentectomy, lobectomy, and mediastinal lymph node dissection are unnecessary.[ 10]

An alternative approach is focused radiation therapy (fractionated stereotactic radiation therapy ), which has been successfully used in adults to control lesions. The estimated 5-year survival rate after thoracotomy for pulmonary metastasectomy has ranged from 10% to 58% in adult studies. Emerging data suggest a similar outcome after the administration of focused radiation therapy.[ 11]

References

1. Demetri GD, Elias AD: Results of single-agent and combination chemotherapy for advanced soft tissue sarcomas. Implications for decision making in the clinic. Hematol Oncol Clin North Am 9 (4): 765-85, 1995. [PUBMED Abstract]
2. Elias A, Ryan L, Sulkes A, et al.: Response to mesna, doxorubicin, ifosfamide, and dacarbazine in 108 patients with metastatic or unresectable sarcoma and no prior chemotherapy. J Clin Oncol 7 (9): 1208-16, 1989. [PUBMED Abstract]
3. Edmonson JH, Ryan LM, Blum RH, et al.: Randomized comparison of doxorubicin alone versus ifosfamide plus doxorubicin or mitomycin, doxorubicin, and cisplatin against advanced soft tissue sarcomas. J Clin Oncol 11 (7): 1269-75, 1993. [PUBMED Abstract]
4. Rao BN: Nonrhabdomyosarcoma in children: prognostic factors influencing survival. Semin Surg Oncol 9 (6): 524-31, 1993 Nov-Dec. [PUBMED Abstract]
5. deCou JM, Rao BN, Parham DM, et al.: Malignant peripheral nerve sheath tumors: the St. Jude Children's Research Hospital experience. Ann Surg Oncol 2 (6): 524-9, 1995. [PUBMED Abstract]
6. Pappo AS, Rao BN, Jenkins JJ, et al.: Metastatic nonrhabdomyosarcomatous soft-tissue sarcomas in children and adolescents: the St. Jude Children's Research Hospital experience. Med Pediatr Oncol 33 (2): 76-82, 1999. [PUBMED Abstract]
7. Pratt CB, Pappo AS, Gieser P, et al.: Role of adjuvant chemotherapy in the treatment of surgically resected pediatric nonrhabdomyosarcomatous soft tissue sarcomas: A Pediatric Oncology Group Study. J Clin Oncol 17 (4): 1219, 1999. [PUBMED Abstract]
8. Pratt CB, Maurer HM, Gieser P, et al.: Treatment of unresectable or metastatic pediatric soft tissue sarcomas with surgery, irradiation, and chemotherapy: a Pediatric Oncology Group study. Med Pediatr Oncol 30 (4): 201-9, 1998. [PUBMED Abstract]
9. Stanelle EJ, Christison-Lagay ER, Wolden SL, et al.: Pulmonary metastasectomy in pediatric/adolescent patients with synovial sarcoma: an institutional review. J Pediatr Surg 48 (4): 757-63, 2013. [PUBMED Abstract]
10. Putnam JB Jr, Roth JA: Surgical treatment for pulmonary metastases from sarcoma. Hematol Oncol Clin North Am 9 (4): 869-87, 1995. [PUBMED Abstract]
11. Dhakal S, Corbin KS, Milano MT, et al.: Stereotactic body radiotherapy for pulmonary metastases from soft-tissue sarcomas: excellent local lesion control and improved patient survival. Int J Radiat Oncol Biol Phys 82 (2): 940-5, 2012. [PUBMED Abstract]

With the possible exception of infants with infantile fibrosarcoma, the prognosis for patients with recurrent or progressive disease is poor. No prospective trial has been able to prove that enhanced local control of pediatric soft tissue sarcomas will ultimately improve survival. Therefore, treatment should be individualized for the site of recurrence, biologic characteristics of the tumor (e.g., grade, invasiveness, and size), previous therapies, and individual patient considerations.

Treatment options for recurrent or progressive disease include the following:

Resection is the standard treatment for recurrent pediatric nonrhabdomyosarcomatous soft tissue sarcomas. If the patient has not yet received radiation therapy, postoperative radiation should be considered after local excision of the recurrent tumor. Limb-sparing procedures with postoperative brachytherapy have been evaluated in adults but have not been studied extensively in children. For some children with extremity sarcomas who have received previous radiation therapy, amputation may be the only therapeutic option.

Pulmonary metastasectomy may achieve prolonged disease control for some patients.[ 9] A large, retrospective analysis of patients with recurrent soft tissue sarcoma showed that isolated local relapse had a better prognosis and that resection of pulmonary metastases improved the probability of survival.[ 10] In 31 children and adolescents younger than 23 years with pulmonary metastases from synovial sarcoma, complete resection of lung metastases appeared to prolong survival when compared with ten other patients who were not considered candidates for metastasectomy.[ 11][Level of evidence: 3iiiA ] All patients with recurrent tumors should be considered for current clinical trials.

Published results of two studies addressed the outcomes for children with relapsed synovial sarcoma. Most patients in one study had distant relapse (29 of 44 patients),[ 12] while most patients in the second study had local relapse (27 of 37 patients).[ 13] Distant recurrence was a poor prognostic variable, while tumor resectability at relapse (as manifested by extremity recurrence) was associated with a better outcome in both studies.

Treatment Options Under Clinical Evaluation

Information about National Cancer Institute (NCI)–supported clinical trials can be found on the NCI website . For information about clinical trials sponsored by other organizations, refer to the ClinicalTrials.gov website .

The following is an example of a national and/or institutional clinical trial that is currently being conducted:

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

References

1. Bergamaschi L, Bisogno G, Manzitti C, et al.: Salvage rates and prognostic factors after relapse in children and adolescents with malignant peripheral nerve sheath tumors. Pediatr Blood Cancer 65 (2): , 2018. [PUBMED Abstract]
2. Maki RG, Wathen JK, Patel SR, et al.: Randomized phase II study of gemcitabine and docetaxel compared with gemcitabine alone in patients with metastatic soft tissue sarcomas: results of sarcoma alliance for research through collaboration study 002 [corrected]. J Clin Oncol 25 (19): 2755-63, 2007. [PUBMED Abstract]
3. Le Cesne A, Cresta S, Maki RG, et al.: A retrospective analysis of antitumour activity with trabectedin in translocation-related sarcomas. Eur J Cancer 48 (16): 3036-44, 2012. [PUBMED Abstract]
4. Garcia-Carbonero R, Supko JG, Maki RG, et al.: Ecteinascidin-743 (ET-743) for chemotherapy-naive patients with advanced soft tissue sarcomas: multicenter phase II and pharmacokinetic study. J Clin Oncol 23 (24): 5484-92, 2005. [PUBMED Abstract]
5. Garcia-Carbonero R, Supko JG, Manola J, et al.: Phase II and pharmacokinetic study of ecteinascidin 743 in patients with progressive sarcomas of soft tissues refractory to chemotherapy. J Clin Oncol 22 (8): 1480-90, 2004. [PUBMED Abstract]
6. Glade Bender JL, Lee A, Reid JM, et al.: Phase I pharmacokinetic and pharmacodynamic study of pazopanib in children with soft tissue sarcoma and other refractory solid tumors: a children's oncology group phase I consortium report. J Clin Oncol 31 (24): 3034-43, 2013. [PUBMED Abstract]
7. van der Graaf WT, Blay JY, Chawla SP, et al.: Pazopanib for metastatic soft-tissue sarcoma (PALETTE): a randomised, double-blind, placebo-controlled phase 3 trial. Lancet 379 (9829): 1879-86, 2012. [PUBMED Abstract]
8. Casanova M, Basso E, Magni C, et al.: Response to pazopanib in two pediatric patients with pretreated relapsing synovial sarcoma. Tumori 103 (1): e1-e3, 2017. [PUBMED Abstract]
9. Belal A, Salah E, Hajjar W, et al.: Pulmonary metastatectomy for soft tissue sarcomas: is it valuable? J Cardiovasc Surg (Torino) 42 (6): 835-40, 2001. [PUBMED Abstract]
10. Zagars GK, Ballo MT, Pisters PW, et al.: Prognostic factors for disease-specific survival after first relapse of soft-tissue sarcoma: analysis of 402 patients with disease relapse after initial conservative surgery and radiotherapy. Int J Radiat Oncol Biol Phys 57 (3): 739-47, 2003. [PUBMED Abstract]
11. Stanelle EJ, Christison-Lagay ER, Wolden SL, et al.: Pulmonary metastasectomy in pediatric/adolescent patients with synovial sarcoma: an institutional review. J Pediatr Surg 48 (4): 757-63, 2013. [PUBMED Abstract]
12. Ferrari A, De Salvo GL, Dall'Igna P, et al.: Salvage rates and prognostic factors after relapse in children and adolescents with initially localised synovial sarcoma. Eur J Cancer 48 (18): 3448-55, 2012. [PUBMED Abstract]
13. Soole F, Maupain C, Defachelles AS, et al.: Synovial sarcoma relapses in children and adolescents: prognostic factors, treatment, and outcome. Pediatr Blood Cancer 61 (8): 1387-93, 2014. [PUBMED Abstract]

The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.

Treatment of Newly Diagnosed Childhood Soft Tissue Sarcoma

Added text to state that a small series reported symptomatic improvement and stable disease in seven patients with desmoid-type fibromatosis who were treated with pazopanib (cited Agresta et al. as reference 48).

Added text to state that a tumor with morphology similar to that of infantile fibrosarcoma has been identified in older children; in these older children, the tumors do not have the t(12;15)( ETV-NTRK3) translocation that is characteristic of the younger patients. In several of these patients, BRAF gene fusions have been identified (cited Kao et al. as reference 69).

Added text about the outcome results of 73 children and adolescents with recurrent malignant peripheral nerve sheath tumor reported by the Italian Sarcoma Group (cited Bergamaschi et al. as reference 127 and level of evidence 3iiiA).

Added text about the patient characteristics and results of a retrospective review of children and young adults younger than 30 years from four institutions, which identified 69 patients with alveolar soft part sarcoma treated primarily with surgery between 1980 and 2014 (cited Flores et al. as reference 152 and level of evidence 3iiA).

Added Sedig et al. as reference 172 and level of evidence 3iiiA.

Treatment of Progressive/Recurrent Childhood Soft Tissue Sarcoma

Added text about the prognostic factors and outcome results reported in an Italian review of 73 children and adolescents with recurrent malignant peripheral nerve sheath tumor (cited Bergamaschi et al. as reference 1 and level of evidence 3iiiA).

This summary is written and maintained by the PDQ Pediatric Treatment Editorial Board , which is editorially independent of NCI. The summary reflects an independent review of the literature and does not represent a policy statement of NCI or NIH. More information about summary policies and the role of the PDQ Editorial Boards in maintaining the PDQ summaries can be found on the About This PDQ Summary and PDQ® - NCI's Comprehensive Cancer Database pages.

Purpose of This Summary

This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about the treatment of childhood soft tissue sarcoma. It is intended as a resource to inform and assist clinicians who care for cancer patients. It does not provide formal guidelines or recommendations for making health care decisions.

Reviewers and Updates

This summary is reviewed regularly and updated as necessary by the PDQ Pediatric Treatment Editorial Board , which is editorially independent of the National Cancer Institute (NCI). The summary reflects an independent review of the literature and does not represent a policy statement of NCI or the National Institutes of Health (NIH).

Board members review recently published articles each month to determine whether an article should:

Changes to the summaries are made through a consensus process in which Board members evaluate the strength of the evidence in the published articles and determine how the article should be included in the summary.

The lead reviewers for Childhood Soft Tissue Sarcoma Treatment are:

Any comments or questions about the summary content should be submitted to Cancer.gov through the NCI website's Email Us . Do not contact the individual Board Members with questions or comments about the summaries. Board members will not respond to individual inquiries.

Levels of Evidence

Some of the reference citations in this summary are accompanied by a level-of-evidence designation. These designations are intended to help readers assess the strength of the evidence supporting the use of specific interventions or approaches. The PDQ Pediatric Treatment Editorial Board uses a formal evidence ranking system in developing its level-of-evidence designations.

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The preferred citation for this PDQ summary is:

PDQ® Pediatric Treatment Editorial Board. PDQ Childhood Soft Tissue Sarcoma Treatment. Bethesda, MD: National Cancer Institute. Updated <MM/DD/YYYY>. Available at: https://www.cancer.gov/types/soft-tissue-sarcoma/hp/child-soft-tissue-treatment-pdq. Accessed <MM/DD/YYYY>. [PMID: 26389361]

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