Breast cancer is the most frequent cancer type among women in the world. There is abundant evidence, that alterations in the breast cancer susceptibility genes, BRCA1 and BRCA2, are present in a large proportion of families with multiple cases of breast and ovarian cancer. Our aim was to better understand the molecular and structural insights associated with the most frequent alterations, found in the BRCA1 and BRCA2 genes, within our patients. We analyzed 50 breast cancer cases. Of those, 24% were found to carry deleterious mutations, and up to 10 rare variants of unknown significance were detected. The frequency of polymorphic changes was considerably different between genes, BRCA1 (55%) and BRCA2 (19.4%). By looking at the protein level, the changes observed within the BRCA1 and BRCA2 genes could affect not only the nucleic location of the protein but also disrupt the folding and, therefore, the tumor suppressor function.

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