P53 Codon 72 and HER2 Codon 655 Polymorphisms in Turkish Breast Cancer Patients

Abstract

The polymorphisms in codon 72 of the tumor suppressor protein p53 (P53) gene and codon 655 of the human epidermal growth factor receptor 2 (HER2) gene have been suggested to play roles in most cancers. The purpose of this study was to investigate the association between common variants of HER-2 and P53 genes with breast cancer risk. Blood samples collected from 204 women with primary breast carcinoma and 192 healthy female controls were analyzed through polymerase chain reaction-restriction fragment length polymorphism methods. The frequencies of Arg/Arg, Arg/Pro, and Pro/Pro genotypes for P53 codon 72 were 51.7%, 41.4%, and 6.9% in patients and 42.6%, 47.3%, and 10.1% in controls, respectively. The frequencies of Ile/Ile, Ile/Val, and Val/Val genotypes for HER2 codon 655 were 75.0%, 22.5%, and 2.5% in patients and 73.4%, 25.0%, and 1.6% in controls, respectively. The genotype and allele frequencies between patient and control groups for P53 gene polymorphism were not significantly different (p = 0.177 and p = 0.07, respectively). Similarly, the genotype and allele frequencies between patient and control groups for HER2 gene polymorphism were not significantly different (p = 0.716 and p = 0.891, respectively). With the exception of association between the P53 codon 72 polymorphism and tumor stages (p = 0.026), there was no significant association between the studied polymorphisms and clinicopathological characteristics. The P53 gene codon 72 Arg/Pro and Her2 gene Ile655Val polymorphisms were not associated with the risk of breast cancer in Turkish women. However, significant associations between the P53 codon 72 and the homozygote and heterozygote Pro genotypes with tumor stages were found.