Medscape
The history and findings in this case are suggestive of combined small cell lung cancer (SCLC).
Globally, lung cancer is the leading cause of cancer incidence and mortality, accounting for an estimated 2 million new diagnoses and 1.76 million deaths per year. It consists of two major subtypes: non-small cell lung cancer (NSCLC) and SCLC. SCLC is unique in its presentation, imaging appearances, treatment, and prognosis. SCLC accounts for approximately 15% of all lung cancers and is associated with an exceptionally high proliferative rate, strong predilection for early metastasis, and poor prognosis.
There are two subtypes of SCLC: oat cell carcinoma and combined SCLC. Combined SCLC is defined as SCLC with non-small cell components, such as squamous cell or adenocarcinoma. Men are affected more frequently than are women. Most presenting patients are older than 70 years and are either a current or former smoker. Patients frequently have multiple cardiovascular or pulmonary comorbidities.
In most cases, patients experience rapid onset of symptoms, normally beginning 8-12 weeks before presentation. Signs and symptoms vary depending on the location and bulk of the primary tumor, but may include cough, wheezing, and hemoptysis as well as weight loss, debility, and other signs of metastatic disease. Local intrathoracic tumor growth can affect the superior vena cava (leading to superior vena cava syndrome), chest wall, or esophagus. Neurologic problems, recurrent nerve pain, fatigue, and anorexia may result from extrapulmonary metastasis. Nearly 60% of patients present with metastatic disease, most commonly in the brain, liver, adrenal glands, bone, and bone marrow. If left untreated, SCLC tumors progress rapidly, with a median survival of 2-4 months.
All patients with SCLC require a thorough staging workup to evaluate the extent of disease because stage plays a central role in treatment selection. The initial imaging workup includes plain film radiography and contrast-enhanced CT of the chest and upper abdomen, brain MRI, and PET-CT. Laboratory studies to evaluate for the presence of neoplastic syndromes include complete blood count, electrolytes, calcium, alkaline phosphatase, alanine aminotransferase and aspartate aminotransferase, total bilirubin, and creatinine. Biopsy is usually obtained via CT-guided biopsy or transbronchial biopsy, though this can vary depending on the location of the tumor.
According to 2023 guidelines from the National Comprehensive Cancer Network (NCCN), most patients with limited-stage SCLC are not eligible for surgery or stereotactic ablative radiotherapy (SABR). Surgery is only recommended for select patients with stage I–IIA SCLC (about 5% of patients). Concurrent chemoradiation or SABR is recommended for patients with limited stage I-IIA (T1-2,N0) SCLC who are ineligible for or do not want to pursue surgical resection. The majority of patients with SCLC have extensive-stage disease, and treatment with systemic therapy alone (with or without palliative radiotherapy) is recommended. Preferred cytotoxic and immunotherapeutic agents can be found in the NCCN guidelines.
Karl J. D'Silva, MD, Clinical Assistant Professor, Department of Medicine, Tufts University School of Medicine, Boston; Medical Director, Department of Oncology and Hematology, Lahey Hospital and Medical Center, Peabody, Massachusetts.
Karl J. D'Silva, MD, has disclosed no relevant financial relationships.
Image Quizzes are fictional or fictionalized clinical scenarios intended to provide evidence-based educational takeaways.