FUT3 and distal colitis: The frequencies of mutant allele (G) and genotype (TG+GG) of FUT3 (rs28362459) were significantly lower in patients with extensive colitis than in those with distal colitis (P<0.001, 95%CI: 0.503–0.742; P = 0.001, 95%CI: 0.567–0.786, respectively).