5 year survival rate is poorly correlated with treatment efficacy. It's mostly correlated with how early a cancer is diagnosed.

In most cases it's a good thing to detect cancers early, but saying a country is good at detecting cancers is not near as strong of a statement as saying that a country is good at treating cancers.

And this gets complicated by prostrate cancer -- many would argue that mass screening for prostrate cancer causes more pain and suffering than it prevents.