Colon cancer is the third most common cancer diagnosed in men and women in the United States, and the second leading cause of cancer death.

“Despite its high incidence, if found early, colon cancer is one of the most preventable, treatable and beatable forms of cancer,” according to BCH gastroenterologist Dennis Ahnen, MD, AGAF, FACG.

Colon cancer often begins with benign or non-cancerous polyps, which are flat or knob-like growths on the lining of the large intestine. While some polyps remain benign, others develop into cancer over time.

“It can take 10 to 15 years for precancerous polyps to develop into colon cancer. With an early screening, we can find these polyps and remove them before they have a chance to turn into a potentially lethal cancer,” Dr. Ahnen said. “Screening can also find the cancer in its early stages, when it’s the most curable.”

The Best Screening is the One That Gets Done

According to Dr. Ahnen, for most men and women, screenings should begin at age 50 and continue until age 75. If a first degree relative of yours — parent, brother, sister or children — has had colon cancer, talk to your provider about getting screened at age 40 or 10 years before the age that your family member was diagnosed with colon cancer, whichever is earlier.

There is more than one way to get screened for colon cancer, from at-home stool blood tests, stool blood plus DNA tests, flexible sigmoidoscopy, CT colonography and colonoscopy screening.

“The advantage of a colonoscopy screening is that it can both find and remove polyps—all in a single test. Its prep can be diffcult, but the preps are getting better,” Dr. Ahnen said.

Talk to your doctor about the pros and cons of the different types of screening. Each has advantages and disadvantages.

“However, the best test is the one that gets done well," Dr. Ahnen added.

Pay Attention to Your Risk Factors

Dr. Ahnen explained that both men and women have the same lifetime risk of colon cancer. Although no one knows the exact cause of the cancer, you should pay attention to these identifiable risk factors:

  • Age over 50: Colon cancer becomes more common as people age. In fact, more than 90 percent of those with colon cancer are diagnosed after age 50.
  • Diet and lifestyle: Diets high in red or processed meat can increase your risk, as well as diets low in fruits, vegetables and fiber. Physical inactivity, obesity, cigarette smoking and heavy alcohol use have also been linked to higher risk of colon cancer.
  • Family history of polyps: If you or a family member has a history of polyps, it may put you at a higher risk.
  • Family history of colon cancer: When a first degree relative of yours has had colon cancer, you are more likely to develop this disease.

Tell Your Relatives: Family History Can Elevate Risk

Dr. Ahnen explained that roughly 10 to 15 percent of the population has a family history of colon cancer. This group has a higher than average risk for developing the disease.

"If you have more than two first degree relatives who have had colon cancer, your risk goes up eight-fold compared to the general population,” Dr. Ahnen said. "Reach out! If you know you have relatives with colon cancer, tell your other relatives to get screened and get informed!"

Dennis Ahnen, MD, FACG, has more than 40 years experience in successfully screening for and treating gastrointestinal diseases. Appointments are available by calling Gastroenterology of the Rockies at 303-604-5000.

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