HLA-A and nasopharyngeal carcinoma: In contrast, the haplotype GG composed of rs2517713 and rs2975042 within the HLA-A gene showed a protective effect against NPC (p = 7.0×10−4; case and control frequency distributions of 0.279 and 0.363), whereas the haplotype TT exhibited high risk for NPC disease (TT, p = 0.0014; case and control frequency distributions of 0.712 and 0.633).