RT Journal Article SR Electronic T1 406 Population-based BRCA1 and BRCA2 testing in Canada: an economic evaluation JF International Journal of Gynecologic Cancer JO Int J Gynecol Cancer FD BMJ Publishing Group Ltd SP A52 OP A53 DO 10.1136/ijgc-2024-ESGO.66 VO 34 IS Suppl 1 A1 Sun, Li A1 Wei, Xia A1 Fierheller, Caitlin T A1 Dawson, Lesa A1 Oxley, Samuel A1 Kalra, Ashwin A1 Sia, Jacqueline A1 Feldman, Fabio A1 Peacock, Stuart A1 Schrader, Kasmintan A A1 Legood, Rosa A1 Kwon, Janice A1 Manchanda, Ranjit YR 2024 UL http://ijgc.bmj.com/content/34/Suppl_1/A52.abstract AB Introduction/Background Cost-effectiveness of population-based BRCA-testing has not been assessed in the Canadian population. Population-based BRCA-testing can identify many more BRCA-carriers who will be missed by the current practice of family-history (FH) based BRCA-testing and can benefit from screening and prevention. This study aims to estimate the incremental lifetime health effects, costs, and cost-effectiveness of population-based BRCA-testing compared with family-history based testing in Canada.Methodology A Markov-model was developed to compare the lifetime costs and effects of BRCA1/BRCA2-testing all general population women over 30-years compared with FH-based testing. BRCA-carriers are offered risk-reducing salpingo-oophorectomy to reduce their ovarian cancer (OC) risk and MRI/mammography-screening/medical prevention/risk-reducing mastectomy to reduce their breast cancer (BC) risk. Outcomes include OC, BC, and additional heart disease deaths and incremental cost-effectiveness ratio (ICER)/quality-adjusted life-year (QALY). The analyses were conducted from both payer and societal perspectives. One-way and probabilistic sensitivity analyses (PSA) were undertaken to explore the uncertainty.Results The base case ICERs of population-based BRCA-testing were $32,276/QALY (payer) or $16,416/QALY (societal) compared to FH-based testing, well below the Canadian cost-effectiveness thresholds. The results were robust for multiple scenarios, one-way sensitivity, and PSA. >99% simulations from payer and societal perspectives were cost-effective on PSA at the $50,000/QALY willingness-to-pay threshold. Population-based BRCA-testing could potentially prevent additional 32,841 BC cases and 6,387 OC cases in the Canadian population, corresponding to averting 2,516 BC deaths and 2,103 OC deaths during a lifetime horizon.Conclusion Population-based BRCA-testing is cost-effective in Canada from payer and societal perspectives. This can prevent 39,228 more breast/ovarian cancer cases and 4,619 breast/ovarian cancer deaths across the population. Our results call for implementation studies in Canada.Disclosures RM has been supported by an NHS Innovation Accelerator Fellowship for population testing. RM declares research funding from The Eve Appeal, Cancer Research UK, Barts & the London Charity, GSK outside this work, as well as an honorarium for advisory board membership for MSD/GSK/Astrazeneca/EGL.