Trial reportScientific reports2021
Mutation analysis using cell-free DNA for endocrine therapy in patients with HR+ metastatic breast cancer.
Trial report in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers, 1 of them a synthesis that pooled it.
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The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
10 citing papers in PubMed, 1 synthesis or guideline pooled it, 11 citations in OpenAlex.
- Circulating tumour DNA and its clinical relevance in predicting progression-free survival and overall survival in patients with advanced breast cancer: a systematic review and meta-analysis.Breast cancer research and treatment · 2026Pooled it
- Biological basis and clinical translation prospects of circulating cell-free DNA in precision management of breast cancer (Review).Oncology letters · 2026Review
- RRM2 as a biomarker and therapeutic target in letrozole resistant estrogen receptor positive breast cancer.Scientific reports · 2026Article
- Cross-Cancer Detectability of ctDNA Biomarkers in Asian Populations: Implications for Pan-Cancer Detection.Cancer management and research · 2026Review
- ESR1 testing on FFPE samples from metastatic lesions in HR + /HER2- breast cancer after progression on CDK4/6 inhibitor therapy.Breast cancer research : BCR · 2025Article
- The Combined Assessment of CTC andInternational journal of molecular sciences · 2025Article
- Serial analysis ofFrontiers in oncology · 2025Article
- The role of everolimus in metastatic breast cancer and possibilities of moving forward-a narrative review.Annals of translational medicine · 2024Review
- The Clinical Utility of Droplet Digital PCR for Profiling Circulating Tumor DNA in Breast Cancer Patients.Diagnostics (Basel, Switzerland) · 2022Review
- Cell-Free DNA Variables including Gene Mutations in CA15-3 Normal Breast Cancer Reflect Prognosis.Disease markers · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
We prospectively evaluated the utility of ESR1 and PIK3CA mutation analysis with cell-free DNA (cfDNA) using droplet digital PCR (ddPCR) for the efficacy of endocrine therapy (ET) in hormone receptive positive (HR+) metastatic breast cancer (MBC) patients. CfDNA was analyzed just before the start of ET for MBC. E380Q, Y537N, Y537S, and D538G were assessed for ESR1 mutations and H1047R, E545K, and E542K were assessed for PIK3CA mutations. A total of 75 patients were enrolled. Of those, 31 (41.3%) received letrozole with palbociclib, and 28 (37.3%) received exemestane and everolimus (EverX). ESR1 mutations were found in 36 (48.0%) patients, of which 16 (21.3%) had more than one variant. Seventeen (23.6%) patients had one PIK3CA mutation and 8 (11.1%) had two. In the total population, time to progression of the first ET after enrollment (TTP1) decreased significantly as the number of ESR1 mutations increased (p < 0.001). PIK3CA mutations were also significantly associated with shorter TTP1 (median TTP1: 16.2 months vs. 10.9 months, p = 0.03). In contrast, PIK3CA mutations were significantly associated with longer TTP in patients receiving EverX treatment (median TTP of EverX: 15.9 months vs. 5.2 months, p = 0.01) and remained a significant factor in multivariable analysis for TTP of EverX in this subgroup (hazard ratio = 0.2, 95% CI = 0.1- 0.8, p = 0.03). ESR1 and PIK3CA mutations in cfDNA were associated with clinical efficacies of ET in HR+ MBC patients.
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