A liquid biopsy assay that tests for only six circulating tumor DNA (ctDNA) methylation markers has shown high accuracy in identifying the risk for relapse among patients with colorectal cancer (CRC).
Patients who were ctDNA methylation positive 1 month after surgery were 17.5 times more likely to relapse, compared with ctDNA-negative patients. And following adjuvant chemotherapy, ctDNA-positive patients had a significantly shorter recurrence-free survival than their ctDNA-negative peers.
Overall, “we found that ctDNA methylation was the most significant prognostic factor for recurrence-free survival among all clinicopathologic risk factors on multivariable analysis,” the authors, led by Shaobo Mo, MD, Fudan University Shanghai (China) Cancer Center, reported in research published in JAMA Oncology.