HLA-DRB1 and primary biliary cholangitis: The risk conferred by the DRB1*08:03-DQB1*06:01 haplotype (OR = 1.86, p = 1.98 × 10−9), but not by haplotypes composed of the other DRB1 alleles and DQB1*06:01 (OR = 1.11, p = 0.28) indicated that DQB1*06:01 itself had a nominal practical effect on the disease development of PBC (Table 3(A)).