NRAS and melanoma: Seventeen melanoma lines lacked both PD-L1 and PD-L2 basal expression, including 5/10 (50%) BRAF/NRASWT, 4/11 (36%) BRAFV600-mutant, 1/10 (10%) NRAS-mutant, and 7/8 (87.5%) uveal cell lines (Figure 1).