Various embodiments of the invention include methods and compositions for evaluating the risk of irinotecan toxicity in a patient. In certain embodiments, the methods include detecting a promoter polymorphism in one or both UGT1A1 genes of the patient. In particular embodiments the promoter polymorphism is a single nucleotide polymorphism and may be in linkage disequilibrium with a UGT1A1 (TA)
n
repeat. The methods may include obtaining a nucleic acid sample from the patient and detecting the presence or absence of a promoter polymorphism. The promoter polymorphism may be at nucleotide position −3440, −3401, −3279, −3177, −3175, or −3156 from the UGT1A1 gene transcriptional start site. The number of TA repeats can be 5, 6, 7, 8 more TA repeats. In particular embodiments, the promoter polymorphism is a −3440C>A, −3401T>C, −3279G>T, −3177C>G, −3175A>G, −3156G>A polymorphism or any combination thereof. Moreover, in other embodiments, identification of a guanine residue at position −3156 indicates the patient does not have a low level of UGT1A1 activity, and therefore, methods and compositions of the invention concern this identification.
本发明的各种实施方案包括用于评估患者
伊立替康毒性风险的方法和组合物。在某些实施方案中,这些方法包括检测患者一个或两个 UGT1A1
基因中的启动子多态性。在特定的实施方案中,启动子多态性是单
核苷酸多态性,可与 UGT1A1 (
TA)
n
重复。这些方法可包括从患者处获取
核酸样本并检测启动子多态性的存在与否。启动子多态性可位于 UGT1A1
基因转录起始位点的
核苷酸位置-3440、-3401、-3279、-3177、-3175 或 -3156。
TA重复序列的数量可以是5、6、7、8个
TA重复序列。在特定的实施方案中,启动子多态性是-3440C>A、-3401T>C、-3279G>T、-3177C>G、-3175A>G、-3156G>A多态性或它们的任意组合。此外,在其他实施方案中,鉴定出-3156位的
鸟嘌呤残基表明患者的UGT1A1活性
水平不低,因此,本发明的方法和组合物与此鉴定有关。