Precision medicine, linked to DNA, still too often misses

Back in January, when President Obama proposed a precision medicine initiative with a goal of "matching a cancer cure to our genetic code," John Moore could have been its poster child. His main tumors were shrinking, and his cancer seemed to have stopped spreading because of a drug matched to the cancer's DNA, just as Obama described. This summer, however, after a year's reprieve, Moore, 54, feels sick every day. The cancer — advanced melanoma like former president Jimmy Carter's — has spread to his lungs, and he talks about "dying in a couple of months."