FAS and HIV-1 infection: The FAS rs1800682 (A/G) and FASL rs5030772 (A/G) polymorphisms have been associated with higher proviral load and the development of human T-cell lymphotropic virus type 1 (HTLV-1)-associated [36,37,38] and with the progression of human immunodeficiency virus type 1 (HIV-1) infection and disease development [39,40].