Drs. Shariat and Roehrborn, UT Southwestern Medical Center (image) UT Southwestern Medical Center Share Print E-Mail Caption Drs. Claus Roehrborn (right), chairman of urology, and Shahrokh Shariat have discovered that hormonal components in over-the-counter dietary supplements may promote the progression of prostate cancer and decrease the effectiveness of anti-cancer drugs. Credit UT Southwestern Medical Center Usage Restrictions Please use credit line. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.