Hubby just had surgery to remove tumor in lung. Turns out it was melanoma. Seems to be metastasized from tumor that was removed 30 years ago on his back. He's also had colon cancer 3 times (eventually removed colon entirely), gone through radiation once and chemo twice. After this recent surgery to remove the mass (and a wedge of lung), the doc recommends Opdivo every two weeks for a year to possibly (hopefully) help him fight off any microscopic cells that might remain. Read about the side effects...ugh. Need to hear about the successes. Thanks for any input.