CDKN2A and acral lentiginous melanoma: In addition, an association between lower levels of the tumour‐suppressor protein, p16(INK4A) in tumour cells, and lower density of CD3+ and CD8+ TILs was found, suggesting a probable relationship between p16(INK4A) and TIL immune response in ALM (Castaneda et al., 2019).