HLA-DRB1 and cervical cancer: A pooled analysis of data from the previous European GWASs and validated in an independent cohort of 961 patients (827 with CIN3 and 123 with cervical cancer) and 1725 controls of European ancestry supported for previously identified loci at 6p21.3 (rs9271898 and rs3130196) and also confirmed associations with reported HLA alleles including HLA-B*07:02, -B*15:01, -DRB1*13:01, -DRB1*15:01, -DQA1*01:03, -DQB1*06:03 and -DQB1*06:02.