Today, breast cancer kills 39 percent fewer women than 25 years ago. Prostate cancer kills 52 percent fewer men, the American Cancer Society announced last week. You can thank new technologies that detect cancer early and defeat it for many of the lives saved. Americans diagnosed with most types of cancer have better odds of surviving it in the U.S. than anywhere else on the planet. But watch out. These staggering achievements are at risk. A chorus of Democratic politicians is kicking off 2018 with renewed calls for universal, government-run health care. Leading the pack for single-payer are presidential contenders...