Stool DNA screening's ten-year follow-up gap
A large retrospective programme found strong colonoscopy yields after positive multi-target stool DNA tests, but many people did not complete the next step on time or repeat a negative test as scheduled.
The 60-second version
A decade of real-world data found strong lesion detection after positive multi-target stool DNA tests, but large gaps in timely colonoscopy and repeat screening.
Key points
- The retrospective cohort included 148,624 tests from 110,410 people, with a 13.6% positivity rate.
- Among positive tests, 65.1% led to colonoscopy within 12 months; advanced adenoma was reported in 30.7% and adenocarcinoma in 1.3% of follow-up colonoscopies.
- Only 35.3% of people with a negative test repeated stool DNA screening within three years.
- The study measured one multi-site programme and did not prove that the test reduces mortality or that delay caused later findings.
Verdict. The weak point was not only test accuracy but follow-through: positive results need timely diagnostic colonoscopy, and negative results still need scheduled rescreening.
The findingThe test worked best when the pathway continued
Multi-target stool DNA testing is designed to find signals associated with colorectal cancer and precancerous lesions without an initial procedure. The study followed the programme's results for a decade, but its central lesson is about what happens after the result arrives: screening has value only when the next step is completed.
After a positive resultColonoscopy found important lesions
The cohort included 19,506 positive tests. Among these, 65.1% were followed by colonoscopy within 12 months; the median wait was 82 days. In the resulting colonoscopies, advanced adenomas were diagnosed in 30.7% and adenocarcinoma in 1.3%. Those are findings among people who proceeded to colonoscopy, not a guarantee about any individual result.
| Measure | What the study reported |
|---|---|
| Advanced adenoma after a positive test | 30.7% of follow-up colonoscopies |
| Adenocarcinoma after a positive test | 1.3% of follow-up colonoscopies |
| Repeat testing after a negative test | 35.3% completed another stool DNA test within 3 years |
The missing linkA negative result still has a timetable
Only 35.3% of people with an initial negative result had another stool DNA test within three years. Among the smaller group who underwent colonoscopy within three years of a negative test, 45.2% had an adenoma or serrated lesion, 9.3% had an advanced adenoma, and 0.5% had colon cancer. Because this was a selected subgroup, these numbers cannot be treated as the test's population-wide false-negative rate.
How to read itThis is a care-cascade study, not a survival trial
The researchers used retrospective records from September 2014 to July 2025 in a multi-site health system. A validated large-language-model pipeline extracted colonoscopy, pathology, and quality endpoints from free-text reports. The analysis found that adenoma detection after positive tests exceeded 50% and that waits longer than six months were associated with more advanced adenoma, with a trend P value of 0.001. Association is not proof that delay caused the finding, and the programme may differ from other health systems.
A screening test is not a single event. It is a chain: test, result, follow-up, and the next scheduled screen.
The practical takeawayMake the handoff impossible to miss
The authors point to system-level tracking and reminders as the next opportunity. For readers, the useful question is not whether one test is good or bad in isolation, but whether a positive result has a documented follow-up plan and whether a negative result has a date for the next screen. That is how a convenient test can become a complete screening pathway.