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Amelanotic acral melanomas: Clinicopathological, BRAF mutation, and KIT aberration analyses

Yoo Duk Choi, Seung Min Chun, Sun A. Jin, Jee-Bum Lee, Sook Jung Yun

Journal of the American Academy of Dermatology, Volume 69, Issue 5, November 2013, Pages 700–707


In all, 26 AAMs (45.7%) were located on the feet of patients, 21 of which (82.9%) showed ulceration. Sixteen cases developed in subungual areas. Nodular melanoma was the most common histopathological subtype (63.6%). The most frequent cell types affected were epithelioid and spindled. HMB-45 staining was strongly positive in 66.7% of AAMs; 4 (12.1%) were negative for HMB-45, and 3 of these were complete-type AAMs. Of 33 total patients, BRAF mutations were detected in 2 AAM cases, and KIT aberrations were present in 11 cases (33.3%). Four cases (12.1%), all of which were complete-type AAMs, had KIT mutations. KIT aberrations were weakly correlated with c-kit staining. Twenty patients were TNM stage I or II, and mean survival was 30.14 ± 4.54 months.