Association Between the T29→C Polymorphism in the Transforming Growth Factor β1 Gene and Breast Cancer Among Elderly White Women

Abstract
Family history is a known risk factor for the development of breast cancer.1 Two genes (BRCA1 and BRCA2) associated with markedly increased risk of breast cancer have been identified, but mutations in these genes are relatively uncommon and account for a small fraction of breast cancer.2,3 Therefore, other genes are likely to modify the risk of breast cancer.4