Аssociation of polymorphisms rs20325282 in ABCB1 gene and rs1695 in GSTP1 gene with the toxic effects during chemotherapy with cyclophosphamide and doxorubicin in breast carcinoma
Published 2019-08-22
Keywords
- brest cancer,
- GSTP1 gene polymorphism,
- cyclophosphamide,
- doxorubicin,
- toxic effects
How to Cite
Copyright (c) 2019 Ilir Ismail

This work is licensed under a Creative Commons Attribution 4.0 International License.
Abstract
Breast cancer is a major morbidity and mortality factor and is among the most frequent female neoplasms globally. Combined cyclophosphamide and doxorubicin adjuvant chemotherapy is frequently associated with a series of toxic effects of different grades and clinical significance. Constitutive polymorphisms in the genes involved in detoxification and metabolism of chemotherapeutics play a key role in toxic effects predisposition. The main goal of this study was to determine the genetic association of polymorphisms rs20325282 in ABCB1 gene and rs1695 (A313G) in GSTP1 gene with occurrence of toxic effects during chemotherapy with cyclophosphamide and doxorubicin in patients with breast carcinoma. Material and methods: The polymorphisms were genotyped in DNA samples derived from 110 cases of breast cancer treated adjuvantly with cyclophosphamide and doxorubicin, after providing a signed consent from each patient. Statistical analyses were performed comparing the clinical data regarding the toxic effects and adverse reactions with the freqencies of the genotypes and alleles of both polymorphisms. Results: the analyses indicated that polymorphisms rs20325282 in ABCB1 gene and rs1695 in GSTP1 have a predictive value in determing the probability and/of risk of occurence of neutropenia, leukopenia and any toxic effect except nausea and vomiting. The polymorphism rs1695 in GSTP1 has a predictive value in estimation of the risk for chemotherapy-induced anemia. Conclusions: these findings could be used prospectively for adjustment and personalisation of the chemotherapy according to the individual genotypes combination in each patient.
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