Welch says, "but [can also] find cancers that were never
going to matter." That's because some cancers grow
slowly and never become dangerous, he says.
This exact same phenomenon is already occurring with breast cancer. Everybody is a "breast cancer survivor" these days, because they keep finding these turtle tumors that were never going to be a problem. If you look at mortality rates between those who screen early and those who don't, they are the same.
https://link.springer.com/article/10.1007/s10549-018-4691-4