Gastrointestinal and genitourinary toxicity profiles of metformin versus placebo in men with prostate cancer receiving prostate radiotherapy: interim toxicity results of a double-b... oleh Julian O. Kim, Megan O. McDonald, Aldrich Ong, Rashmi Koul, Arbind Dubey, William Hunter, Shahida Ahmed, Harvey Quon, Don Yee, Matthew Parliament, Gokulan Sivananthan, Brita Danielson, Lindsay Rowe, Sunita Ghosh, Nawaid Usmani