CC BY-NC-ND 4.0 · Indian J Med Paediatr Oncol 2011; 32(01): 25-29
DOI: 10.4103/0971-5851.81886

Role of glutathione-s-transferase and CYP1A1FNx012A polymorphisms in the therapy outcome of south Indian acute lymphoblastic leukemia patients

K J Suneetha
Department of Molecular Oncology, Cancer Institute (WIA), Chennai, Tamil Nadu, India
K Nirmala Nancy
Department of Molecular Oncology, Cancer Institute (WIA), Chennai, Tamil Nadu, India
K R Rajalekshmy
Department of Hematology & Immunology, Cancer Institute (WIA), Chennai, Tamil Nadu, India
R Rama
Department of Biostatistics & Tumor Registry, Cancer Institute (WIA), Chennai, Tamil Nadu, India
T G Sagar
Department of Medical Oncology, Cancer Institute (WIA), Chennai, Tamil Nadu, India
T Rajkumar
Department of Molecular Oncology, Cancer Institute (WIA), Chennai, Tamil Nadu, India
› Author Affiliations
Source of Support DST (DST No. SR/SO/HS-26/2004)


Background: Polymorphisms in the drug-metabolizing enzymes are found to be associated with the inter-individual variation in response to a particular drug. Glutathione S-transferases (GSTs) are involved in the metabolism of several anticancer drugs, including alkylating agents, anthracyclines, and cyclophosphamides. Aim: The present study is aimed to examine the association of GST and CYP1A1FNx012A polymorphisms in the susceptibility to acute lymphoblastic leukemia (ALL) and the prognostic significance. Materials and Methods: A total of 92 immunophenotyped patients and 150 cord blood controls were genotyped by PCR for GSTM1 and GSTT1, RQ-PCR allelic discrimination assay for GSTP1 and PCR-RFLP for CYP1A1FNx012A polymorphism. Results: We have previously reported the significant association of GSTM1 (null) and combined GSTP1 {(Ile/Val)/ (Val/Val)} /GSTM1 (null) genotype with the susceptibility to ALL. No significant association was observed with GSTT1 (P=0.75) and CYP1A1FNx012A (P=0.61 for +/- and P=0.86 for -/- respectively) in the susceptibility to ALL. Survival analysis was performed in 50 of the 92 patients who were followed for three years. Kaplan-Meier survival analysis for three years showed significant lower event-free survival in patients harboring GSTP1 (Ile/Val) and GSTP1 (Val/Val) (P=0.038 and 0.0001, respectively) genotype. Cox regression analysis revealed GSTP1 as an independent prognostic marker with 6-fold higher risk with Val/Val genotype (P=0.003). Conclusions: Our results show that GSTP1 (Ile/Val) polymorphism has a role in the susceptibility to ALL and also influence treatment outcome.

Publication History

Article published online:
16 August 2021

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