Data: Colorectal cancer is one of the deadliest forms for people under 50 Fox News senior medical analyst Dr. Marc Siegel joins 'America's Newsroom' to discuss the death of actor James Van Der Beek due to colorectal cancer, what could cause this kind of cancer and how to address it. NEW You can now listen to Fox News articles! As colorectal cancer (CRC) is now the leading cause of cancer death in adults under 50, a new report reveals some surprising shifts in the incidence of the disease.