HLA-DRB1 and cervical carcinoma: Another study conducted in Europe, including a total of 2866 cervical cancer cases and 6481 controls confirmed the strong association of the MHC with cervical neoplasia, and identified the amino acid positions 13 and 71 in HLA-DRB1 and 156 in HLA-B (within both HLA Class I and Class II alleles).