Polymorphisms in the MTHFR, ABCB1, ABCC2, ABCG2, SLCO1B, miR-1206, miR-3683, CAT, and VDR genes were associated as risk factors for OM and polymorphisms in the TYMS and miR-4268 genes were associated as protective factors. Here, MTHFR is linked to ocular melanoma.