Remote delivery of cancer genetic testing in veterans with metastatic prostate cancer: A Million Veteran Program pilot study.

[BACKGROUND] Germline pathogenic variants can inform targeted therapy for metastatic prostate cancer (mPC), and improve cancer early detection and risk reduction for family members. Guidelines recommend germline genetic testing be offered to all men with mPC, yet uptake of testing is only 10%-12%.

[METHODS] This prospective study enrolled veterans participating in the VA Million Veteran Program (MVP) with a diagnosis of mPC. Veterans were contacted by mail with option to opt-out of future contact. Eligible veterans who did not opt-out were mailed study information and received a follow-up phone call to establish interest in germline testing. Participants provided verbal consent and were mailed a saliva collection kit for a CLIA-level multigene cancer predisposition gene panel test. Results were disclosed to the patient and oncology provider. All steps were performed with genetic counseling support.

[RESULTS] Of 2104 eligible patients, 1952 veterans with mPC did not opt out. Of these, 681 (35%) provided consent and 459 (24%) completed testing. Of those who were approached 63% were White and 25% were Black. Fifty-nine (13%) of those completing testing carried a germline pathogenic variant in a cancer risk gene. Of the 37 eligible for targeted therapy, 14 received targeted therapy, 18 did not yet have an indication for that therapy, and five were deceased without having received targeted therapy.

[CONCLUSIONS] Participant completion of remote germline testing was facilitated at rates higher than the 10% previously reported. Remote genetic testing can augment uptake of testing in large, integrated health care systems.