It's called the "invisible disease," yet according to the American Cancer Society, lung cancer claims about 127,000 lives each year - roughly the same amount as breast, pancreatic, and prostate cancer combined. That's why when former optometrist John, 77, learned he had a PD-L1 expression non-small cell lung cancer, he prepared for the worst. While he was able to undergo chemotherapy, his health only declined further. But John found renewed hope when he qualified for an alternative treatment that offered better results. Medical Stories visits John in Chillicothe, Ohio, as he shares how he managed to fight back against one of the deadliest forms of cancer. This episode also features in-depth commentary from renowned expert David P. Carbone, MD, PHD, Barbara J. Bonner Chair in Lung Cancer, Director of the James Thoracic Center, The Ohio State University.