Thomas A. Sellers1, Lauren C. Peres2, Cassandra A. Hathaway2 and Shelley S. Tworoger2 1Division of Oncological Sciences, Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon 97239, USA 2Department of Cancer Epidemiology, Moffitt Cancer Center & Research Institute, Tampa, Florida 33612, USA Correspondence: Shelley.Tworogermoffitt.org

Given the challenges with achieving effective and durable treatment for epithelial ovarian cancer, primary prevention is highly desirable. Fortunately, decades of research have provided evidence for several strategies that can be deployed to optimize risk reduction. These include surgery, chemoprevention, and lifestyle factor modifications. These broad categories vary in terms of the magnitude of risk reduction possible, the possible short-term and long-term side effects, the degree of difficulty, and acceptability. Thus, the concept of a risk-based model to personalize preventive interventions is advocated to guide discussion between care providers and women at risk. For women with inherited major gene mutations that greatly increase risk of ovarian cancer, surgical approaches have favorable risk to benefit ratios. Chemoprevention and lifestyle factor modifications portend a lower degree of risk reduction but confer lower risk of undesirable side effects. Since complete prevention is not currently possible, better methods for early detection remain a high priority.