Medical Discovery News, May 10, 2008 Saturday's edition of Medical Discovery News, by UTMB Professors Norbert Herzog and David Niesel, focused on breast cancer and light. Noting that breast cancer rates in industrialized countries is six times that of developing countries, researchers have turned their attention to the effect that artificial light has on melatonin levels. Medical Discovery News airs at 10 a.m. on KUHF-FM in Houston. The program is aired by 48 radio stations.