Patients' experiences with pre-test genetic counseling provided by breast cancer healthcare professionals: Results from a large prospective multicenter study.

Background: Pre-test genetic counseling of patients with breast cancer is increasingly being offered by non-genetic healthcare professionals. We aimed to evaluate the experiences of patients with breast cancer receiving pre-test genetic counseling from a non-genetic healthcare professional (i.e., surgeon or nurse).

Methods: Patients who were diagnosed with breast cancer and received pre-test counseling from their surgeon or nurse (mainstream group), and patients who received pre-test counseling from a clinical geneticist (usual care group) were invited to participate in our multicenter study. Between September 2019 and December 2021, patients received a questionnaire after pre-test counseling (T0) and four weeks after receiving their test results (T1) to evaluate psychosocial outcomes, knowledge, discussed topics and satisfaction.

Results: We included 191 patients in our mainstream and 183 patients in our usual care group and received, respectively 159 and 145 follow-up questionnaires. Levels of distress and decisional regret were comparable in both groups. Decisional conflict was higher in our mainstream group (p = 0.01), but only 7% had clinically relevant decisional conflict (vs 2% in usual care group). The possible implications of a genetic test on (secondary) breast or ovarian cancer risks were less frequently discussed in our mainstream group (p = 0.03 and p = 0.000, respectively). In both groups knowledge about genetics was comparable, satisfaction was high and the majority of patients in both groups preferred to give both verbal and written consent for genetic testing.

Conclusion: Mainstreamed genetic care provides sufficient information for the majority of breast cancer patients to decide about genetic testing with minimal distress.