[CFW]

"Article doesn't say colonoscopy was to prevent cancer. Did you read it?"

_______________

Did you read the title of the article we are responding to?

"Colonoscopy-screening does not prevent colorectal cancer as well as previously assumed (Sample tests 18% less helpful)"

[TangoLimaSierra]

Did you read the title of the article we are responding to?

Of course. Which is why I asked if you had read the article.
It seems from your comment that you only read the headline. Everything in your comment was covered in the article.
You should know by now that headlines are clickbait.