Pivotal Role of Genetic Counselors in the Uptake of Germline Genetic Testing in Non-Metastatic Breast Cancer and the Impact of Testing on Surgical Decision Making.

Background: Genetic testing is increasingly utilized in breast cancer patients; however, testing rates remain low. We aimed to evaluate the rate of genetic testing at a tertiary academic medical center utilizing a multidisciplinary clinic model including genetic counselor.

Methods: A single-center retrospective chart review was performed on a cohort of newly diagnosed breast cancer patients from January 2018 through February 2019. Patients were reviewed for genetic screening eligibility, consultation with a genetic counselor, and test results.

Results: Final analysis included 426 patients. 261 (61.3%) were found to meet National Comprehensive Cancer Network guidelines for genetic testing, of which 178 patient (68.2%) underwent testing and 32 patients (12.3%) declined testing. Of the 165 not eligible for testing, 5 patients were tested. A total of 183 patients underwent testing and 116 (63.4%) had a negative result, 17 (9.3%) were positive for at least one gene mutation and 50 (27.3%) were identified to have a variant of unknown significance (VUS). There was a positive association between those patients who met with a genetic counselor and eligibility for testing (OR 31.1, 95% CI 16.0-60.5).

Conclusions: Genetic testing result has become an increasingly important factor when defining optimal surgical treatment for breast cancer patients. Increasing the availability of genetic consultation for breast cancer patients can improve testing rates and patient selection.