Cancer group: Colon screening should start at age 45, not 50

NEW YORK — New guidelines released Wednesday recommend U.S. adults start colon cancer screening earlier, at age 45 instead of 50.

The American Cancer Society’s advice puts it out of sync with guidelines from an influential government advisory group, which kept the age at 50 in an update two years ago.

Cancer society officials acknowledge the shift to 45 could cause confusion for doctors and patients but felt strongly that they needed to act now. The advocacy group was influenced by its study, published last year, that found rising rates of colon cancer and deaths in people younger than 50. Experts aren’t sure why there has been a 50 percent increase in cases since 1994.

The guidelines are for men and women ages 45 to 75 of average risk for colon cancer; recommendations are different for people with certain conditions, like Crohn’s disease, or a family history of colon cancer. The group endorses six kinds of screening exams, from inexpensive takehome stool tests performed every year to colonoscopies done every 10.

“All of these tests are good tests,” said the cancer society’s Dr. Rich Wender.

The same tests are recommended by the U.S. Preventive Services Task Force, which reviews evidence and issues advice for a variety of screenings and treatments. It updated its colon cancer guidelines in 2016. Its next review isn’t expected until around 2021. That panel’s recommendations drive what screening is covered by insurance under the Affordable Care Act, although 20 states have laws that link coverage to the cancer society guidelines.