BRCA 2 is a DNA repair mutation, which prevents (other) DNA mutations which might effectively prevent cancer. Survival rate does not depend on your age, but on the progress of this malignancy. BRCA is more dangerous in that it prevents DNA repair and thus precludes or minimizes the efficiency of chemotherapy. Prophylactic mastectomy is to a greater benefit in BRCA patients, provided that they survive the primary treatment, because the systemic risk of the initial malignancy will not be altered. If the malignancy has been characterized as “node-negative,” it is also a good sign.