The nurse is preparing a client with breast cancer for BRCA1 and BRCA2 genetic testing. Which pathophysiological process should the nurse use to support client teaching?

A. BRCA1 and BRCA2 provide protection of mature, functioning breast and ovarian cells. This is not accurate; BRCA1 and BRCA2 genes are involved in DNA repair, and mutations in these genes increase cancer risk. B. The choice of treatment is best determined by the sensitivity of these genetic markers. While genetic markers can influence treatment decisions, this option does not directly address the role of BRCA1 and BRCA2 mutations in cancer risk. C. Mutations in BRCA1 or BRCA2 identify a client's risk for cancerous cell development in breast tissue. This is correct. Mutations in these genes significantly increase the risk of developing breast and ovarian cancer. D. The prognosis of breast cancer is most successful when these markers are inherited mutations. This statement is incorrect. The presence of BRCA1 or BRCA2 mutations influences risk, not necessarily prognosis or treatment success.