ArticleClinical cancer research : an official journal of the American Association for Cancer Research2026
The Prognostic and Predictive Impact of ctDNA Levels in Patients with Advanced Breast Cancer Enrolled on the plasmaMATCH Trial.
Article in Clinical cancer research : an official journal of the American Association for Cancer Research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Article
- The role of serologic biomarkers "liquid biopsy" in the fight against breast cancer: From biological foundations to clinical impact.iScience · 2026Review
- Article
- Metastatic Triple Negative Breast Cancer: Navigating a Rapidly Evolving Therapeutic Landscape.Oncology research · 2026Review
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Authors and funding
19 authors.
Funding
Abstract
purposectDNA dynamic levels may identify patients who will respond to therapy. We assessed ctDNA baseline levels and on-treatment dynamics in patients with advanced breast cancer on the plasmaMATCH trial with mutation-targeted therapies (cohorts A-D) and triple-negative breast cancer on olaparib and ceralasertib combination (cohort E). EXPERIMENTAL
designBlood samples were collected at baseline [cycle 1 day 1 (C1D1)] and before treatment on cycle 2 day 1 (C2D1). Samples were sequenced using error-corrected targeted panels (Guardant360/GuardantOMNI). Circulating DNA ratio was calculated as the ratio of C2D1/C1D1 circulating DNA ratio, and baseline ctDNA levels were associated with progression-free survival (PFS) and confirmed objective response rates (ORR).
resultsA total of 167 patients had assessable C1D1-C2D1 ctDNA results. There was a strong association between baseline ctDNA levels and response in cohort E; low baseline levels were associated with longer PFS (HR, 0.33; P = 0.001) and higher ORR (40% vs. 9.7%; P = 0.02). In cohorts A to D, there was a weaker association with PFS (HR, 0.60; P = 0.03) and ORR (15.2% vs. 5.7%; P = 0.17). Associations of baseline ctDNA level and ORR were validated in the independent PEARL study. For on-treatment dynamics, suppression of ctDNA below median was predictive in cohorts A to D (HR, 0.47; P = 0.001) but not in cohort E (HR, 1.02; P = 0.94). Undetectable ctDNA levels at C2D1 were associated with good outcomes in both cohorts: in cohort E with improved PFS (HR, 0.25; P = 0.01) and improved ORR (86% vs. 11%; P = 0.01). Six of seven patients with undetectable on-treatment ctDNA were BRCA1/BRCA2/PALB2 wild type.
conclusionsBaseline low ctDNA levels predict response to targeted therapy, potentially suggesting shared mechanisms between high ctDNA release and resistance to therapy. Both baseline ctDNA levels and on-treatment dynamics are a promising surrogate endpoint for drug development, with clearance of ctDNA being a robust cross-therapy surrogate for outcomes.
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