Researchers at City of Hope, one of the largest and most advanced cancer research and treatment organizations in the United States, ranked among the nation’s top 5 cancer centers by U.S. News & World Report and a national leader in providing cancer patients with best-in-class, integrated supportive care programs, now understand why taking an investigational white button mushroom supplement shows promise in slowing and even preventing prostate cancer from spreading among men who joined a phase 2 clinical trial studying “food as medicine.”