HLA-B and nasopharyngeal carcinoma: For instance, even in Hildesheim's report, the extended haplotype HLA-A*0207/HLA-B*4601 was characterized by a higher odds ratio to develop NPC than the HLA-A*0207 allele alone suggesting a more complex genetic explanation for such association than the displacement by the HLA-A*0207 allele of other HLA class I alleles belonging to the HLA-A*02 family.