CD274 and mucosal melanoma: The extent of the presence of CD8+ TILs was classified as mild, moderate, or severe, and the association between PD-L1 expression and location was examined, and in 31% of acral melanomas, 44% of mucosal melanomas, 10% of uveal melanomas, and 62% of CSD melanomas, PD-L1 expression was found.