HLA-DRB1 and nasopharyngeal carcinoma: The HLA alleles appearing most frequently in patients with NPC were -A*02, 11, and 24; -B*15 and 46; -DRB1*12, 09, and 08; -DQB1*03, 05, and 06; and -DQA1*01, 03, and 06.