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Glutathione S-transferase T1, M1 and P1 Genetic Polymorphisms and Susceptibility to Colorectal Cancer in Turkey

  • Gorukmez, Ozlem (Department of Medical Genetics, School of Medicine, Uludag University) ;
  • Yakut, Tahsin (Department of Medical Genetics, School of Medicine, Uludag University) ;
  • Gorukmez, Orhan (Sevket Yilmaz Training and Research Hospital, Medical Genetics Unit) ;
  • Sag, Sebnem Ozemri (Department of Medical Genetics, School of Medicine, Uludag University) ;
  • Topak, Ali (Department of Medical Genetics, School of Medicine, Uludag University) ;
  • Sahinturk, Serdar (Department of Medical Genetics, School of Medicine, Uludag University) ;
  • Kanat, Ozkan (Department of Medical Oncology, School of Medicine, Uludag University)
  • Published : 2016.08.01

Abstract

Colorectal cancer (CRC) is reproted to be the third most common cancer worldwide and the fourth most common cause of cancer related deaths. CRC is considered to be a multifactorial disease whose risk varies due to the complex interaction between individual genetic basis and disposure to multiple endogenous factors. Glutathione S-transferases are pro-carcinogenic in CRC and are required for the conjugation between chemotherapeutics and broad spectrum xenobiotics. One hundred and eleven patients with CRC and 128 control subjects without any cancer history were enrolled in this study. Multiplex PCR was applied to determine polymorphisms for the GSTT1 and M1 genes, and PCR-RFLP was applied for the GSTP1 (Ile105Val) gene polymorphism. Values p<0.05 were defined as statistically significant. We detected a significant high correlation between predisposition for CRC and presence of the Ile/Ile genotype of the GSTP1 (IIe105Val) gene polymorphism, but we did not find a significant relationship between predisposition for CRC and GSTT1 and M1 deletion polymorphisms. In addition, we did not determine a relationship between GSTT1, M1 and P1 gene polymorphisms and any clinicopathological features of CRC. GSTT1 null/GSTM1 positive and GSTT1 null/GSTM1 positive/GSTP1 Ile/Ile genotypes were significantly higher in the patient group. Our results revealed that there is no relationship among CRC, its clinicopathologic features, and GSTT1 M1 gene polymorphisms. However, there was a significant correlation between CRC and the GSTP1 Ile/Ile genotype. Further studies with larger patient groups are required to delineate the relationships between GST gene polymorphisms and the clinicopathologic features of CRC in Turkey.

Keywords

Colorectal cancer;GST;polymorphism;clinicopathology;Turkey

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