Colonoscopies Don’t Just Detect Cancer — They Can Stop It Before It Starts

Most cancer screenings are designed to catch disease early. Colonoscopies, however, can do something even more powerful: stop colorectal cancer before it starts. According to Dr. Patrick Boland of RWJBarnabas Health, that preventive ability is what makes colonoscopies unique compared with nearly every other cancer screening tool.

“I think it is important just to point out that with colonoscopy, really the difference with colonoscopy and all the other screening tests for colon cancer, and really all the other cancer screening tests in general, or almost all of them, is that colonoscopy can actually sort of dial the clock back,” Boland explained.

How colonoscopies can prevent cancer before it starts

During a colonoscopy, doctors are able to examine the inside of the colon and remove abnormal growths known as polyps. Some polyps are precancerous, meaning they can eventually develop into colorectal cancer if left untreated. By identifying and removing these growths early, physicians can interrupt the disease process entirely.

“That’s actually one of the reasons why we favor colonoscopies,” Boland said. “They can go in there and they could take out tiny polyps before they become big polyps, or big polyps before they turn into a cancer.”

This ability to both detect and prevent cancer sets colonoscopy apart from many other commonly used screening methods. Mammograms, for example, are designed to identify breast cancer early, but they do not prevent tumors from forming. Colonoscopies, meanwhile, can eliminate potential cancer threats during the screening itself.

“So, you can actually prevent cancers, not just find them early,” Boland said. “I mean, the hope is to do both, either prevent them and/or find them early.”

Why screening at age 45 matters more than ever

Colorectal cancer is one of the most common cancers diagnosed in the United States, but experts say it is also one of the most preventable when routine screening is performed consistently. In recent years, physicians have become increasingly concerned about rising colorectal cancer rates among younger adults, prompting updated screening recommendations.

Current guidelines recommend that adults at average risk begin colorectal cancer screening at age 45. People with a family history of colorectal cancer, inflammatory bowel disease or certain genetic conditions may need to begin screening earlier or undergo testing more frequently.

While some stool-based screening tests can help detect signs of colorectal cancer, Boland noted that colonoscopy remains especially valuable because it allows physicians to directly visualize and remove suspicious lesions in real time.

“Compared to mammography or other tests like that, we can actually prevent them with a colonoscopy,” he said.

Doctors continue to encourage patients not to delay screening, emphasizing that early detection — and prevention — can significantly improve outcomes and reduce colorectal cancer deaths.

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