BRCA1 (BReast CAncer Gene 1), a key gene that becomes faulty in some instances, leading to breast and ovarian cancer, plays an important role in the body’s DNA repair mechanisms. BRCA1, once mutated, can cause cancer to develop. According to the Center for Familial Breast and Ovarian Cancer at the Vienna General Hospital, it is believed that if the BRCA1 or BRCA2 gene is mutated, the likelihood of developing breast and ovarian cancer increases to 85% and 53% respectively.