Association of XRCC3, XRCC4, BAX, and BCL-2 polymorphisms with the risk of breast cancer

Abstract

Background: breast cancer is the most common malignancy in women. Genetic risk factors associated with breast cancer incidence have been identified. Aims: this study is aimed at determining the association of XRCC3 Thr241Met (rs861539), XRCC4 G(-1394) T (rs6869366) DNA repair and BAX G(-248) A (rs4645878), and BCL2 C(-938) A (rs2279115) apoptotic gene polymorphisms with breast cancer. Materials and Methods: genetic analysis was performed using peripheral blood samples. Gene polymorphisms were detected by using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) technique. 175 patients and 158 healthy controls were enrolled in the study. Results: breast cancer risk was 5.43 times more in individuals with AA genotype of Bax G(-248) A (rs4645878) (). The risk of metastasis was 11 times with this genotype. It was associated with 6 times more risk of having a tumor larger than 2?cm. The risk of breast cancer was 2.77 times more in individuals carrying the Met/Met genotype of XRCC3 Thr241Met (rs861539) (). The risk of having advanced clinical stage (stage III+IV) with the Met/Met genotype was 4 times more increased. No relationship with breast cancer was found with XRCC4 G(-1394) T (rs6869366) and BCL2 C(-938) A (rs2279115) gene polymorphisms. Conclusion: multicenter trials using subjects with genetic variations are needed to establish the relationship between breast cancer and single gene polymorphism.