UGT1A1 and neoplasm: The group of SULT1A1*1/*1 and UGT1A1*1/*1, UGT1A1*1/*33 and UGT1A1*33/*33 high-activity genotypes was associated with tumor size ≤2 cm (OR = 9.02, CI = 1.59–51.31, P = 0.01; Table 3) and low tumor grade (OR = 10, CI = 1.09–100, P = 0.04; Table 3).