"That brings us to the star of our show. The Nordic-European Initiative on Colorectal Cancer (NordICC) is a huge randomized trial aimed at rigorously measuring how much colonoscopies reduce cancer and death"

https://asteriskmag.com/issues/04/you-re-invited-to-a-colonoscopy?ref=thebrowser.com#did-the-trial-actually-show-that-colonoscopies-are-great