> For colon cancer, the rates from the SEER data are are 91%, 74%, and 16%.

This is the only claim the article makes directly about colon cancer. Otherwise, it's saying that early detection being beneficial isn't supported by survival rates alone.

"Otherwise, it's saying that early detection being beneficial isn't supported by survival rates alone."

That claim may be obvious to everybody except me. Anyway it turns out to be true.