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Updated: Aug 5, 2026
Detection and Monitoring of Tumor Associated Circulating DNA in Patient Biofluids
Published on: June 8, 2019
Dynamic Circulating Tumor DNA Methylation Monitoring Guiding Postoperative Surveillance in Nonmetastatic Colorectal
Shaobo Mo1,2, Chaoqiang Zhou2,3,4, Maoguang Ma1,2
1Department of Colorectal Surgery, Fudan University Shanghai Cancer Center, Fudan University, Shanghai, China.
Purpose:
We hypothesized that a dynamic surveillance strategy guided by circulating tumor DNA (ctDNA) methylation would increase the rate of curative-intent therapy for recurrence in patients with nonmetastatic colorectal cancer (CRC) after curative resection.
Methods:
The FIND trial (ClinicalTrials.gov identifier: NCT05904665) is a prospective, multicenter, randomized, phase III study. Patients with nonmetastatic CRC were randomly assigned to ctDNA-guided surveillance or standard computed tomography (CT)-based monitoring. In the ctDNA-guided group, a positive ctDNA result triggered immediate CT imaging; if negative, bimonthly CT continued alongside quarterly ctDNA testing. After two consecutive ctDNA-negative results, imaging reverted to standard frequency. The primary end point was the proportion of patients with recurrence receiving curative-intent metastasis-directed therapy.
Results:
Among 584 eligible patients (289 ctDNA-guided, 295 control) in the modified intention-to-treat population, with a median follow-up of 23.3 months, recurrence rates were similar (18.0% v 18.6%, P = .919). The ctDNA-guided group had a significantly higher rate of curative-intent treatment (48.1% v 23.6%, relative risk 2.03, P = .008). The median time to clinical recurrence was significantly shorter in the ctDNA-guided group than in the control group (9.5 v 13.4 months; P < .001), representing a lead time of 3.9 months. Among recurrences confined to the liver and/or lungs, the ctDNA-guided group showed higher curative resection rates (42.3% v 18.2%, P = .002). These patients had more favorable hepatic metastatic features: fewer lesions (≤3: 75.0% v 28.6%, P = .005), smaller tumor size (≤3 cm: 90.0% v 57.1%, P = .033), and more unilobar disease (80.0% v 28.6%, P = .002).
Conclusion:
ctDNA methylation-guided dynamic surveillance improves the rate of curative-intent therapy for recurrence in patients with initially nonmetastatic CRC through earlier detection of resectable metastases, pending validation of long-term survival benefit in future analyses with mature data.
