Thiopurine S-methyltransferase gene polymorphism and 6-mercaptopurine dose intensity in Indian children with acute lymphoblastic leukemia.
The prevalence of thiopurine S-methyltransferase (TPMT) polymorphism and its association with clinical and hematological toxicities was retrospectively analyzed in 71 Indian children with acute lymphoblastic leukemia (ALL). Only heterozygous TPMT alleles were observed (10%, 7/71) with relative frequencies being *1/*3C (4.2%), *1/*2 (4.2%) and *1/*3A (1.4%). The median 6-mercaptopurine dose administered during the maintenance therapy was 31% lower among patients with heterozygous TPMT alleles versus the rest (32.1mg/m(2)/day and 46.2mg/m(2)/day, p=0.005), though the myelosuppression and toxicities were similar in both the groups. Identification of TPMT genotype appears to be important in making the ALL treatment more effective and less toxic.
Department of Pediatric Hematology and Oncology, Rajiv Gandhi Cancer Institute and Research Centre, Sector 5, Rohini, Delhi 110085, India. gauri kapoor2000@yahoo.com
Gauri
G
Kapoor
Rupal
R
Sinha
Rahul
R
Naithani
Meenal
M
Chandgothia
D000964:Antimetabolites, Antineoplastic / Q000008:administration & dosage*; D002648:Child; D002675:Child, Preschool; D004305:Dose-Response Relationship, Drug; D005260:Female; D005838:Genotype; D006801:Humans; D007194:India; D007223:Infant; D008297:Male; D015122:Mercaptopurine / Q000008:administration & dosage*; D008780:Methyltransferases / Q000235:genetics*; D011110:Polymorphism, Genetic / Q000235:genetics*; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000188:drug therapy* / Q000235:genetics* / Q000473:pathology; D012189:Retrospective Studies; D015996:Survival Rate; D016896:Treatment Outcome
D000964:Antimetabolites, Antineoplastic; D015122:Mercaptopurine; D008780:Methyltransferases; C022745:thiopurine methyltransferase