Every year, doctors diagnose more than 107,000 cases of colorectal cancer. While survival rates have improved, it’s still the second-leading cause of cancer deaths in men and women combined.
To improve your odds of detecting this cancer early enough to effectively treat it, here are the facts behind eight common colon cancer myths.
1. Myth: Only Older People Get Colon Cancer
It’s easy to see where at least part of this myth came from. The risk of getting a colon cancer diagnosis does increase as you get older (the average age at diagnosis is 66), but rates have been rising among millennials and Gen Zers.
“We’ve seen a growing, concerning trend of what we call early-onset colorectal cancer, meaning colorectal cancer being diagnosed in patients under the age of 50,” says Jun Gong, MD, an associate professor of medicine and medical director of the Colorectal Cancer Program at Cedars-Sinai in Los Angeles.
2. Myth: You Can’t Prevent Colon Cancer
3. Myth: If I Have a Healthy Lifestyle, I Won’t Get Colon Cancer
It’s worth checking in with your parents, siblings, and children if you’re not already familiar with their cancer history. People whose close relatives have colon cancer are nearly twice as likely to get the same diagnosis. Shared gene mutations, inherited syndromes, and common environmental exposures are some of the possible reasons why this cancer tends to run in families.
Whether you have one close relative with colon cancer or several, early screening is important when it’s in your family tree. Your doctor might suggest starting colonoscopy screening even earlier than current guidelines recommend.
4. Myth: If I Had Colon Cancer, I Would Have Symptoms
The often silent nature of this cancer makes early screening important. Testing can detect colon cancer before symptoms appear.
5. Myth: Screening Starts at Age 50
This was once true. Guidelines used to recommend colorectal cancer screening for adults starting at age 50, but the advice has changed.
Most organizations, including the American Cancer Society, the U.S. Preventive Services Task Force (USPSTF), and the American College of Gastroenterology (ACG), now suggest starting screening at age 45 for people who are at average risk for colon cancer. Screening at a younger age increases the chance that colon cancer will be found at an early stage, and reduces the risk of dying from this cancer.
6. Myth: Colonoscopy Is the Only Colon Cancer Screening Method
Colonoscopy is considered the “gold standard” screening test. That’s because it’s the most effective diagnostic method, identifying about 95 percent of colon cancers. During this test, which is recommended every 10 years for people at average risk, the doctor uses a long, flexible tube to see inside the colon and remove any polyps before they turn into cancer.
The fecal immunochemical test (FIT) finds hidden blood in the stool, avoiding a procedure entirely. FIT is noninvasive, but it’s less accurate than colonoscopy (it detects about 79 percent of these cancers) and it can’t remove any polyps that are in the colon. “Patients need to understand that if [the test result is] positive, they will inevitably need a colonoscopy because that’s the only definitive test,” says Gong.
7. Myth: Polyps Are Always Cancer
Not true. Polyps found in the colon are actually precancerous. “If you remove them, you essentially prevent the chance of the polyps becoming colon cancer,” says Gong. However, if you don’t remove polyps, they can eventually develop into cancer.
8. Myth: Colon Cancer Isn’t Curable
“If you are diagnosed with stage 1, 2, or 3 colon cancer, it is considered curable with surgery,” says Gong. About 90 percent of people whose colon cancer is caught at an early stage will still be alive five years later. Even once the cancer has spread outside the colon to nearby lymph nodes or other tissues, the five-year relative survival rate is more than 70 percent. Metastatic colon cancer that has spread to distant areas of the body isn’t curable, but it is manageable with treatments.
The Takeaway
- Colon cancer is typically diagnosed in older adults, but the incidence is rising among people under age 50.
- New guidelines recommend starting screening at age 45.
- Colonoscopy is the gold-standard for diagnosing colon cancer, but tests like flexible sigmoidoscopy and FIT are alternatives.
- Following screening recommendations, along with lifestyle changes like a healthy diet and exercise, increases the chance of diagnosing colon cancer early, when it’s most curable.
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