UGT1A1 and cholelithiasis: An increased number UGT1A1 promoter repeats was associated with increased risk for cholelithiasis (Z = 5.09, P = 3.57 × 10−7 for (TA)7/(TA)7; Z = 4.27, P = 1.93 × 10−5 for (TA)7/(TA)8; compared with (TA)6/(TA)6).