ABSTRACT The Biobehavioral Cancer Prevention and Control Training Program (BCPT), a 20-year collaboration between the University of Washington and the Fred Hutchinson Cancer Research Center, provides interdisciplinary research training to pre-doctoral and post-doctoral trainees to prepare them to be the next generation of leaders in cancer control research. The objectives of the program for the next 5 years are to: 1) recruit excellent and diverse pre-doctoral and post-doctoral applicants from social and behavioral science- based disciplines, as well as PhD or MD-trained basic or clinician scientists who wish to add a social and behavioral sciences perspective to their cancer research; 2) provide trainees with an exceptional interdisciplinary training experience that includes expert mentorship, research experience in active cancer prevention and control projects, and leadership opportunities within those projects and within the trainee community; and 3) skill development in grant writing, preparing scientific manuscripts and oral presentations for conferences, and career planning. We propose to support two pre-doctoral and four post-doctoral trainees each year; ideally each trainee would be supported for two years and we would support at least 18 trainees over the 5-year period. We will also maintain our affiliate program to extend BCPT training and mentoring opportunities to other trainees funded from different sources. The unique collaboration between the University of Washington and the Fred Hutchinson Cancer Research Center provides a rich array of qualified mentors, formal coursework, and cancer research projects trainees engage with. We engaged faculty from multiple academic settings to train and support BCPT trainees; these faculty will be a major presence in the next five years of training. Formal coursework at the University of Washington is provided within the School of Public Health Departments of Health Systems and Population Health, Epidemiology, and Biostatistics, the School's interdisciplinary programs in Public Health Genetics and Public Health Nutrition, the School of Pharmacy, as well as within the School of Nursing for appropriate candidates. Doctoral programs are offered in all these departments. Trainees will complete research experience with their mentors at the Fred Hutchinson Cancer Center, the Seattle Cancer Care Alliance, and the University of Washington. Over the life of BCPT, we have appointed 34 predoctoral fellows, 19 postdoctoral fellows, and have provided support to 20 affiliated fellows (who were not funded through BCPT). The vast majority of our trainees have completed BCPT and gone on to research careers in cancer control. The BCPT provides trainees the knowledge, skills, and professional experiences they require to transition to successful careers in cancer prevention and control.