Plain-English translation of NCT06609551 on ClinicalTrials.gov ↗ · Source last updated · Translation generated · How we translate trials
Phase 3 — Testing in thousands of people, comparing the treatment against what doctors currently use. This is the last big step before approval.
This trial tests whether a blood test called ctDNA can help doctors choose the best chemotherapy plan for older patients with colon cancer after surgery. The blood test looks for tiny pieces of cancer DNA in your bloodstream, which can tell doctors if cancer cells are still present even though surgery removed the tumor. Based on your test results, you may receive different treatments — some patients might be watched closely without chemotherapy, while others get one of two different chemotherapy regimens.
Standard colon cancer treatment gives all patients the same chemotherapy, but not all patients need it, and different patients respond better to different drugs. This trial is trying to find a smarter way to match each patient with the treatment that's right for them, potentially avoiding unnecessary chemotherapy for some while giving more effective treatment to others.
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You will have tissue samples taken from your surgery and a blood test to check for cancer DNA. Based on your blood test results, you will be randomly assigned to one of four groups: watching and waiting without chemotherapy, or receiving one of two different chemotherapy treatments for 6 months. All participants will have follow-up blood tests, CT scans, and tumor marker checks every 6 months for as long as the study continues, to see if the cancer comes back.
AI-generated summary from trial data · Aug 14, 2026 · Not medical advice
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