Linked Life Data

19830600

Source:http://linkedlifedata.com/resource/pubmed/id/19830600

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pubmed-article:19830600pubmed:abstractTextFunctional polymorphisms in the thiopurine methyl transferase (TPMT) gene have been associated with varying levels of enzyme activity and the occurrence of toxicity related to thiopurines. A total of 98 patients (66 pediatric and 32 adults) with precursor B acute lymphoblastic leukemia (Pre-B ALL) were evaluated for TPMT gene polymorphisms. The inability to tolerate 6-mercaptopurine (6-MP) at conventional doses was considered as a surrogate marker of hematologic toxicity. The allele frequency of TPMT*2, *3A, *3B and *3C in the study population was 0.5, 0, 0 and 2.6%, respectively, similar to the frequency observed in other Asian populations. Five patients were heterozygous for TPMT*3C variant allele, and one of these patient's was compound heterozygous with TPMT*2 variant as the other allele. The impact of TPMT polymorphisms on the toxicity and treatment outcome was assessed in 66 pediatric patients only, as there was no variant TPMT detected in the adult patients. Three of the 5 patients (60%) heterozygous for TPMT*2 or TPMT*3C polymorphisms and 12/61 patients (20%) with wild type TPMT genotype had more than 10% of reduction of 6-MP dose (P=0.07). The presence of TPMT polymorphisms did not seem to completely explain the variation in 6-MP toxicity in this small group of patients. Other novel variants in TPMT or variations in the genes involved in transport and biotransformation of 6-MP need to be evaluated in the Indian population.lld:pubmed
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pubmed-article:19830600pubmed:articleTitleFrequency of TPMT alleles in Indian patients with acute lymphatic leukemia and effect on the dose of 6-mercaptopurine.lld:pubmed
pubmed-article:19830600pubmed:affiliationDepartment of Haematology, Christian Medical College, Vellore, India.lld:pubmed
pubmed-article:19830600pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:19830600pubmed:publicationTypeComparative Studylld:pubmed
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