Bowel cancer is the second-leading cause of cancer deaths worldwide, killing nearly 1 million people per year, and cases of colorectal cancer have been on the rise. But there are glimmers of hope after two studies found that using immunotherapy drugs before surgery dramatically increased the chance of curing bowel cancer in certain patients. John Yang speaks with Dr. Vikram Reddy to learn more. PBS News is supported by - https://www.pbs.org/newshour/about/funders