Mailed home kits raised colorectal cancer screening at 2 years, then the gap narrowed
☕ Includes a question for the family ↓
Colorectal cancerPart of a story we are following · 4 articles · See every update
A test kit that arrives in your mailbox can get you screened for colorectal cancer. In a new trial, clinics that mailed kits to patients had many more people up to date after two years. By year three, the difference between mailing and usual care had shrunk.
The useful part for you is simple. The home kit works as a way in, and it is a good reminder to check when you last got screened.
What is a FIT kit?
FIT stands for fecal immunochemical test. It looks for tiny amounts of blood in a stool sample, which can be a sign of polyps or cancer. You collect the sample at home and mail it back. If the result is positive, the next step is a colonoscopy.
How the study worked
Researchers ran a trial from June 1, 2021, to May 31, 2024, at 16 clinics run by 2 community health centers in Southern California, with results published Oct. 1, 2026, in JAMA Network Open. Clinics, not individual patients, were assigned by chance to mailed outreach or usual care, and the trial counted who got screened, not cancer deaths. The patients were ages 50 to 75 and not up to date with screening. Mailed outreach included an educational booklet, a FIT kit and phone reminders, repeated each year.
What they found
At the two-year mark, screening was clearly higher where kits were mailed. At three years, usual care clinics had caught up most of the way.
| Up to date with screening | Clinics that mailed kits | Usual care clinics |
|---|---|---|
| After 2 years | 37.8% | 27.0% |
| After 3 years | 39.4% | 36.5% |
The year-two gap was about 11 points, or 10.8 percentage points to be exact. That is a big boost for a mailing.
The year-three gap was 2.9 percentage points. The researchers called that difference not statistically significant, which means it was too small to tell apart from chance. Screening in the mailing clinics held steady and even edged up, from 37.8% to 39.4%. What changed is that usual care clinics rose from 27.0% to 36.5%.
Why did the gap narrow?
Part of the answer is a change in the plan. Because of limited resources, the mailings in year 3 started earlier than planned. Some people who had finished their screening in year 2 were not yet due to repeat the kit, so they did not count as new wins.
The researchers also say the program needs steady support to keep working the same way. Their conclusion is that centralized mailed outreach could increase screening in community health centers serving people who have long had lower screening rates, as long as the program keeps running as designed.
What you can do today
Find out when you last had a colorectal cancer screening. Check your patient portal, an old visit summary or a call to your clinic. If you are between 50 and 75 and not up to date, ask whether a home stool test is an option for you. If one ever comes back positive, the follow-up colonoscopy is the step that counts.
Talk about it at home
A mailed kit is a way for scientists to ask a simple question: if you make a health check easy to do at home, do more people do it? The researchers gave some clinics a kit to send out and left other clinics to carry on as usual, then counted who finished the check. Think of two gardens, where one gets a little extra watering and the other does not, and you watch which one grows more.
Question for the table
Why do you think the scientists compared clinics that mailed kits with clinics that did not, instead of just looking at the clinics that mailed them? What do you think the comparison tells them?
Keep exploring
Copies this article and its questions so you can paste them into ChatGPT, Claude, Gemini or the AI you use, and keep the conversation going.
Questions and answers
- What is a FIT test?
- It is a stool test you do at home. It finds tiny amounts of hidden blood, which can be a sign of polyps or colorectal cancer.
- Did mailing the kits work?
- At 2 years, 37.8% of patients at mailing clinics were up to date versus 27.0% at usual care clinics. At 3 years the gap was no longer statistically significant.
- Who was in the trial?
- Patients ages 50 to 75 who were not up to date with screening, at 16 clinics run by 2 community health centers in Southern California.
- What happens if a home test is positive?
- A colonoscopy is the next step. It helps find the cause and remove any polyps.
