HLA-DQA1 and nasopharyngeal carcinoma: The other five protective alleles of rs28749142 tagging SNP of HLA-Aaa-Q62, rs2523589 upstream of HLA-B, rs9265975 downstream of HLA-B, rs9461780 near TRIM39, and rs117495548 near HLA-DQA1 are also more frequent in other low-NPC incidence populations.