HLA-A and nasopharyngeal carcinoma: It may also be relevant that the sequence of HLA-A*11:01 allele (F = 0.25 in this population) differs by only one amino acid residue (Lys19Glu) from that of the HLA-A*11:02 allele (F = 0.04), yet HLA-A *11:02 shows no apparent association with NPC onset.