The role of BRCA mutation testing in determining breast cancer therapy.

Landmark discoveries in the field of breast cancer research include the identification of germline BRCA mutations as a cause of hereditary disease, and the use of gene-expression profiling to identify distinct subtypes of breast cancer. These findings, coupled with the availability of rapid germline testing, make it possible to identify a BRCA mutation carrier contemporaneous with a diagnosis of breast cancer. For the first time, testing for a germline mutation that predisposes to cancer has the potential to influence the immediate surgical, radiotherapeutic, and drug treatment choices of an individual with a new diagnosis of breast cancer. In this Review, we examine the implications of moving germline BRCA mutation testing from highly specialized family cancer clinics to mainstream settings.