Abstract
BackgroundA large number of distinct mutations in the BRCA1 and BRCA2 genes have been reported worldwide, but little is known regarding the role of these inherited susceptibility genes in breast cancer risk among Kazakhstan women.AimTo evaluate the role of BRCA1/2 mutations in Kazakhstan women presenting with sporadic breast cancer.MethodsWe investigated the distribution and nature of polymorphisms in BRCA1 and BRCA2 entire coding regions in 156 Kazakhstan sporadic breast cancer cases and 112 age-matched controls using automatic direct sequencing.ResultsWe identified 22 distinct variants, including 16 missense mutations and 6 polymorphisms in BRCA1/2 genes. In BRCA1, 9 missense mutations and 3 synonymous polymorphisms were observed. In BRCA2, 7 missense mutations and 3 polymorphisms were detected. There was a higher prevalence of observed mutations in Caucasian breast cancer cases compared to Asian cases (p<0.05); higher frequencies of sequence variants were observed in Asian controls. No recurrent or founder mutations were observed in BRCA1/2 genes. There were no statistically significant differences in age at diagnosis, tumor histology, size of tumor, and lymph node involvement between women with breast cancer with or without the BRCA sequence alterations.ConclusionsConsidering the majority of breast cancer cases are sporadic, the present study will be helpful in the evaluation of the need for the genetic screening of BRCA1/2 mutations and reliable genetic counseling for Kazakhstan sporadic breast cancer patients. Evaluation of common polymorphisms and mutations and breast cancer risk in families with genetic predisposition to breast cancer is ongoing in another current investigation.
Highlights
Breast cancer is the most common malignancy in females and one of the leading causes of death from cancer in women worldwide.[1]
156 Kazakhstan patients with sporadic breast cancer were analyzed for mutations throughout the entire coding regions of the BRCA1 and BRCA2 genes, using direct sequencing
Whereas the majority of studies on BRCA gene mutations have focused on western populations with a family history of breast or ovarian cancer, only a relatively small number of investigations on the role of the BRCA genes have been undertaken in Asian sporadic breast cancer populations
Summary
Breast cancer is the most common malignancy in females and one of the leading causes of death from cancer in women worldwide.[1]. 2. Germline mutations in BRCA1 and BRCA2 genes account for genetic predisposition and increased risk of breast and ovarian cancers.[3] Two major breast cancer susceptibility genes are BRCA1 A large number of distinct mutations in the BRCA1 and BRCA2 genes have been reported worldwide, but little is known regarding the role of these inherited susceptibility genes in breast cancer risk among Kazakhstan women. Aim: To evaluate the role of BRCA1/2 mutations in Kazakhstan women presenting with sporadic breast cancer. Methods: We investigated the distribution and nature of polymorphisms in BRCA1 and BRCA2 entire coding regions in 156 Kazakhstan sporadic breast cancer cases and 112 age-matched controls using automatic direct sequencing. Evaluation of common polymorphisms and mutations and breast cancer risk in families with genetic predisposition to breast cancer is ongoing in another current investigation
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