(UPI) -- Derivatives of resveratrol -- found in red wine grapes -- may impede cancer cell development, U.S. researchers said. The National Cancer Institute has teamed with a biotech firm to examine the potential benefit of resveratrol among cancer patients. Dr. Bryan C. Donohue of the University of Pittsburgh Medical Center, Shadyside Hospital, says early-stage clinical trials now under way are examining resveratrol's effectiveness among patients with heart disease, cancer, dementia and a host of other modern illnesses