Influence of GSTT1, GSTM1 and GSTP1 Polymorphisms on the Development of Breast Cancer

Marisol Rodríguez, Fernando Mejia, Mariana Lecourtois, Victoria Domínguez, Julieta Castillo

Centro de Investigación en Ciencias Médicas, Universidad Autónoma del Estado de México, Toluca de Lerdo, México.
Facultad de Odontología, Universidad Autónoma del Estado de México, Toluca de Lerdo, México.
Facultad de Química, Universidad Autónoma del Estado de México, Toluca de Lerdo, México.

DOI: 10.4236/jct.2014.56063                

Abstract

Introduction: Every year, more than 10 million women are diagnosed worldwide with breast cancer. Breast cancer remains the leading cause of death from malignancy in women. In Mexico about 12 Mexican women die every day from this disease. Glutathione S-transferase (GST) family consists of a group of isoenzymes involved in Phase II detoxification of xenobiotics by glutathione conjugation. There have been reports showing GST polymorphisms as a risk factor for developing cancer. Objective: Determine if the frequencies of polymorphisms of GSTT1, GSTM1 and GSTP1 are associated with breast cancer development. Materials and Methods: We studied 22 women with breast cancer and a control group of 30 women. DNA was extracted from blood. Polymorphisms of T1 and M1 were identified by multiplex PCR. The identification of GSTP1b (exon 5) and GSTP1c (exon 6), was performed separately by RFLP-PCR, using BsmAI and AciI enzymes respectively. Results: Frequencies of polymorphisms were as follows: for breast cancer group 33% null GSTT1 vs 40% null in the control, 32% null GSTM1 vs 63% of control; 63% heterozygote GSTP1b P1a/P1b and 18% homozygote P1b/P1b, vs 53% heterozygote and 20% homozygote in the control, 41% heterozygote P1a/P1c GSTP1c and 0% homozygote vs 10% heterozygote P1c/P1c and 0% homozygote control. Significant differences were found between GSTM1 and GSTP1c polymorphisms with GSTM1 null percentage higher in the control group and a higher frequency of P1c heterozygotes in the cancer group. Conclusion: As this is a pilot study where the results showed no association with breast cancer, further investigation is required on the involvement of GST genes in neoplasm development.

Keywords

Breast Cancer, Polymorphisms, GSTM1, GSTT1, GSTP1

Conflicts of Interest

The authors declare no conflicts of interest.

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