July 7, 2011 6:56 pm Colorectal Cancer Deaths Lower in the North Dr. John Marks talks about colorectal cancer. He also compares the colon cancer deaths in the North and South and talks about why the survival rate is different. US & World Videos 3:04 PurpleStride event in Philly raises money for those battling pancreatic cancer 3:27 ‘Take a Breather' and run to help battle against cystic fibrosis 1:49 How much time do you spend on your phone each week? Keith Jones, Erin Coleman talk screen time 2:52 Join the fight for ovarian cancer treatment and research at the Sandy Sprint 3:13 Movement, memory and Parkinson's awareness