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• W2891635765 abstract "e21063 Background: Melanoma is a biologically heterogeneous disease that varies by ethnicity and histology. While superficial spreading (SSM) histology is the most common subtype in non-Hispanic whites (NHW), acral lentiginous (ALM) and other subtypes occur more frequently in Hispanics, Asians and African Americans. There are no known risk factors for ALM, and further investigation is warranted. Methods: We retrospectively reviewed a database of melanoma patients diagnosed between 2001-2016 at LAC-USC. Overall survival (OS) was estimated using Kaplan-Meier methodology, and comparisons performed using log-rank testing. Fisher’s exact test was used to evaluate associations between relevant clinicopathological variables. A p-value < 0.05 was considered statistically significant. Results: Among 272 melanoma patients, there were 140 Hispanics (51.5%), 105 NHW (38.6%), 14 Asians, and 4 African Americans. The most frequent histology among Hispanics was ALM (30.7%), while SSM was the most frequent among NHW (33.3%). BRAF V600 mutations were found in 34.5% (10/29) and 58.8% (10/17) of Hispanics and NHW, respectively. A total of 52 patients with ALM were identified, including 43 Hispanics (82.7%). There was a significant association between no prior history of non-melanoma skin cancer (NMSC) and ALM (p < .0001). Median Breslow thickness for ALM was 4.2 mm, and 32.7% were ulcerated. The rate of BRAF V600 mutations among 13 ALM patients tested was 0%. NRAS mutations were found in 3 ALM patients; KIT amplification/mutations were found in 2 ALM patients. Conclusions: We identified a population enriched for Hispanic patients with ALM. We found an association between no prior NMSC and ALM, suggesting that UV exposure is not a causative risk factor. BRAF mutations are less common amongst Hispanics, and nearly absent in ALM. Survival differences were not statistically significant, but cannot be ruled out due to low number of patients in this early study. [Table: see text]" @default.
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• W2891635765 date "2017-05-20" @default.
• W2891635765 modified "2023-09-22" @default.
• W2891635765 title "Frequency and outcomes of melanoma subtypes in a diverse population: The Los Angeles County – University of Southern California (LAC-USC) Medical Center experience." @default.
• W2891635765 doi "https://doi.org/10.1200/jco.2017.35.15_suppl.e21063" @default.
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