PURPOSE
This study addresses a gap in knowledge regarding socioeconomic factors, facility type, and overall survival in stage I vs stage IV Amelanotic Melanoma.
BACKGROUND
Amelanotic Melanoma (AM) is a rare form of melanoma that lacks pigment and accounts for approximately 5% of melanomas. Light skin color and increasing age are important risk factors. Although curable when diagnosed early, it is often missed or mistaken for other benign conditions. A study investigating the impact of facility type on overall survival between stage I vs stage IV AM has yet to be done.
METHODS
This is a retrospective study of patients diagnosed with Amelanotic Melanoma (ICD-8730) between 2004 and 2020 in the National Cancer Database (NCDB) to compare demographic features and overall survival (n = 2147). Exclusion criteria included missing data.
DATA ANALYSIS
Descriptive statistics for all AM patients were collected. Median household income and facility type were compared between patients diagnosed with stage I and stage IV AM using Pearson Chi- Square test. Breslow thickness and overall survival between stage I and stage IV were evaluated using independent t-test and Kaplan-Meier test, respectively. All variables were evaluated for a significance of P < .05.
RESULTS
Most cases analyzed were White (98.1%), male (58.6%), and had Medicare as the primary payor at diagnosis (51.1%). Of 2147 cases, 497 were stage I (23.1%) and 164 were stage IV AM (7.6%) with a mean age at diagnosis of 66.05 and 63.72 years, respectively. There was a significant difference in overall survival between stage I (mean = 118.7 months) and stage 4 (mean = 42.4 months, P < 0.001). The average Breslow thickness was 1.17mm in stage I and 2.59mm in stage IV (P<0.05). More patients diagnosed at stage I used academic facilities than those diagnosed at stage IV (43.9% vs 33.8%, P<0.05). Most patients diagnosed at stage I were high income compared to patients diagnosed at stage IV (55% vs 43.2%, P<0.05).
CONCLUSIONS
With the overall survival of stage IV AM being significantly worse, we hope this study can provide a starting point in the study and prevention of disparities in the early diagnosis of AM.