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The cancer you can throw away before it exists
💡 Colorectal cancer usually grows from slow-developing polyps, so screening can remove the precancer and prevent the cancer from ever forming.
Most cancers are found; colorectal cancer can often be prevented outright. That's because it usually doesn't appear overnight — it grows slowly from a small, benign clump of cells on the bowel lining called an adenomatous polyp. Over roughly 10 years, a fraction of these polyps accumulate genetic changes and can turn malignant. That long, quiet runway is the opportunity.
During a colonoscopy, a doctor can spot these polyps and snip them out on the spot — interrupting the sequence before any cancer forms. Other tools, like stool-based tests (which detect hidden blood or altered DNA), flag people who then need a colonoscopy. This is why screening for colorectal cancer does something screening for many cancers cannot: it lowers not just deaths, but the number of cancers that ever develop.
Major guidelines now suggest average-risk adults start screening at age 45 rather than 50, partly because cases in younger adults have been rising. People with a family history or certain conditions may start earlier — a personal decision to make with a clinician.
Source: U.S. Preventive Services Task Force — Colorectal Cancer Screening Recommendation