This is not especially new information, by the way. The important thing to emphasize here is: You've got lots of precancerous cells in your body right now, and

This is not especially new information, by the way. The important thing to emphasize here is: You've got lots of precancerous cells in your body right now, and most of them will either die or will sit around harmless for the rest of your life. A few might grow into a tiny tumor, which in turn is overwhelmingly likely to sit around, or eventually die. By the time you've got a tumor that you or your doctors can find, that tumor's odds of being vulnerable to a full spontaneous regression are rather low -- because, if they were so vulnerable, the odds are that they would have regressed before growing numerous enough to be detected. It does happen, though, to the extremely lucky ones.