title: The UGT1A1*28 genotype and the toxicity of low-dose irinotecan in patients with advanced lung cancer.
abstract: The association between the UGT1A1*28 genotype and the severe toxicity of low-dose irinotecan has been controversial, and few studies have examined this association in patients with lung cancer. The aim of this study was to assess the association between the UGT1A1*28 genotype and the severe toxicity of low-dose irinotecan in Japanese patients with lung cancer. From December 2005 through July 2008, 53 Japanese patients with advanced lung cancer who underwent chemotherapy that included low-dose irinotecan (50 or 60 mg/m2) as a single agent or in combination chemotherapy were retrospectively analyzed. Genomic DNA was extracted from peripheral blood. Genotypes for the UGT1A1*28 were denoted as wild-type for 6/6, heterozygous for 6/7, or homozygous for 7/7 depending on the number of TA repeats found in each allele. Of the 53 patients, 42 (79.2%) were wild-type, 9 (17.0%) were heterozygous, and 2 (3.7%) were homozygous for the UGT1A1*28 genotype. The UGT1A1*28 genotype was not associated with grade 3 or 4 neutropenia, thrombocytopia, diarrhea, or febrile neutropenia. The frequency of dose reduction of irinotecan did not differ between wild-type and heterozygous or homozygous for the UGT1A1*28 genotype. In addition, there were no significant differences in response rates and survival between wild-type and heterozygous or homozygous for the UGT1A1*28 genotype. In conclusion, the UGT1A1*28 genotype did not predict the severe toxicity of low-dose irinotecan in patients with lung cancer. Therefore, low-dose irinotecan could be administered without reducing starting dose in patients with UGT1A1*28 genotype.
authors.affiliation: Division of Respiratory Medicine and Allergology, Department of Internal Medicine, Showa University School of Medicine, Tokyo 142-8666, Japan.
authors.forename: Tomohide
authors.initials: T
authors.lastname: Sugiyama
authors.forename: Takashi
authors.initials: T
authors.lastname: Hirose
authors.forename: Sojiro
authors.initials: S
authors.lastname: Kusumoto
authors.forename: Takao
authors.initials: T
authors.lastname: Shirai
authors.forename: Toshimitsu
authors.initials: T
authors.lastname: Yamaoka
authors.forename: Kentaro
authors.initials: K
authors.lastname: Okuda
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Ohnishi
authors.forename: Tohru
authors.initials: T
authors.lastname: Ohmori
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Adachi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage* / Q000009:adverse effects; D002166:Camptothecin / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives*; D002289:Carcinoma, Non-Small-Cell Lung / Q000188:drug therapy / Q000235:genetics / Q000473:pathology; D004305:Dose-Response Relationship, Drug; D005260:Female; D005838:Genotype; D014453:Glucuronosyltransferase / Q000235:genetics*; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D000077146:Irinotecan; D008175:Lung Neoplasms / Q000188:drug therapy* / Q000235:genetics* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic / Q000235:genetics; D011379:Prognosis; D012189:Retrospective Studies; D055752:Small Cell Lung Carcinoma / Q000188:drug therapy / Q000235:genetics / Q000473:pathology; D000099148:UGT1A1 Enzyme
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D002166:Camptothecin; D014453:Glucuronosyltransferase; D000077146:Irinotecan; D000099148:UGT1A1 Enzyme