中国人尿苷二磷酸葡糖苷酸转移酶1A基因多态性与伊立替康毒性的相关性

目的评价伊立替康(CVT-11)联合5-氟尿嘧啶(5-Fu)和亚叶酸钙(LV)治疗晚期大肠癌的毒性与尿苷二磷酸葡糖苷酸转移酶1A(UGT1A)基因多态性的相关性。方法收集70例晚期大肠癌患者及健康志愿者的外周血,提取基因组DNA,PCR法扩增目的基因片段,直接测序法分析UGT1A基因多态性,并与毒性进行相关性分析。结果70例晚期大肠癌患者的3～4度中性粒细胞减少发生率为20.O%(14/70);2～4度迟发性腹泻发生率为22.9%(16/70),其中3-4度迟发性腹泻率仅为5.7%(4/70)。UGT1A1*28的野生基因型TA6/6患者的2-4度迟发性腹泻发生率为15.7%,低于TA6/7和TA7/7基因型的患者(P=0.027)。健康人群和大肠癌患者UGT1A基因家族中各个基因多态性的分布无差别。结论UGT1A1*28的野生基因型TA6/6在中国人中分布频率较高,这也是CPT-11为主方案治疗晚期大肠癌发生严重迟发性腹泻较少的原因。

Polymorphisms of UGT1A gene and irinotecan toxicity in Chinese colorectal cancer patients

Objective To assess the polymorphism of UCT1A gene in Chinese, and to investigate the correlation between UGT 1 A polymorphism and irinotecan toxicity in colorectal cancer patients. Methods 70 patients with advanced colorectal cancer were treated with irinotecan and 5-fluorouracil. Polymorphism analysis was performed in all those patients and 100 healthy subjects. Genomic DNA was extracted from peripheral blood and genotyped using polymerase chain reaction and direct sequencing. Results 14 patients exhibiting grade 3-4 neutropenia (20. 0% ), 16 patients experienced grade 2 - 4 diarrhea ( 22. 9% ) , including only 4 patients with grade 3-4 diarrhea (5.7% ). Compared with TA6/7 and TA7/7, UGT1A1 * 28 wild genotype TA6/6 was significantly associated with reduced toxicity (42.1% vs. 15.7%, P = 0.027). There was no significant difference in the distribution of UGT1A genotypes between colorectal cancer patients and healthy subjects. Conclusion Chinese patients exhibit less irinotecan-related diarrhea due to higher frequence of UGT1A1 *28 wild genotype TA6/6.