The National Academies National Cancer Policy Forum hosted a Summer 2022 workshop to explore the current state of knowledge regarding risk factors for cancer and best practices for cancer prevention and risk reduction interventions. Speakers reviewed the current evidence base, examined best practices and innovative approaches for clinic- and population-based cancer prevention, and discussed strategies to promote effective communication about cancer prevention. This Proceedings of a Workshop summarizes the discussions held during the workshop. This workshop is the second in a series examining policy issues in cancer prevention and cancer screening. The first workshop, which took place in 2020, focused on advancing the development and implementation of effective, high-quality cancer screening.