UGT1A7 and gastric cancer: Since important candidate UGT1A polymorphisms, including UGT1A1*6, UGT1A1*27, UGT1A1*28, UGT1A1*60, UGT1A7, and UGT1A9*22, may play key roles in irinotecan metabolism, we evaluated the frequencies of UGT1A polymorphisms and their association with toxicity and other parameters in Korean gastric cancer patients.