Leon Sun is a Mathematical Statistician for the Surveillance Systems Branch (SSB) of the Surveillance Research Program (SRP) within the Division of Cancer Control and Population Sciences (DCCPS) at the National Cancer Institute (NCI). Dr. Sun earned his M.D. from Norman Bethune Medical University and a Ph.D. in Trauma from the Research Institute of Surgery.

Dr. Sun came to SRP from Duke University, where he served as the director of the Duke Prostate Cancer Database and Biorepository in the Division of Urology. Before his career at Duke, he was an associate professor in the Department of Surgery at the Uniformed Services University of the Health Sciences, where he served as the lab chief in the Trauma Molecular Biology Laboratory, then the director of the National Longitudinal Prostate Cancer Database of the Department of Defense (DoD) Center for Prostate Disease Research. He has published more than 120 peer-reviewed articles and book chapters, and has earned numerous grant awards from NIH, the DoD, and the pharmaceutical industry. His research interests include prostate cancer related molecular markers, epidemiology, racial disparities, screening strategies, data modeling, and optimal management. As an Oracle certified database administrator (DBA), Dr. Sun is also highly experienced in medical database design and development, medical data collection and analysis, and real-time individualized medicine systems.

At SRP, Dr. Sun's current projects focus on improving the efficiency of Surveillance Epidemiology and End Results (SEER) data collection, analysis and dissemination, SEER data quality analysis and improvement, and SEER activity process management.