{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T02:42:05Z","timestamp":1787625725134,"version":"build-2736575974"},"reference-count":71,"publisher":"Public Library of Science (PLoS)","issue":"11","license":[{"start":{"date-parts":[[2023,11,1]],"date-time":"2023-11-01T00:00:00Z","timestamp":1698796800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Forschungskommission Freiburg, Faculty of Medicine, University of Freiburg","award":["3095120035"],"award-info":[{"award-number":["3095120035"]}]},{"DOI":"10.13039\/501100021729","name":"Faculty of Medicine, University of Freiburg","doi-asserted-by":"crossref","award":["Berta-Ottenstein-Programme for Clinician Scientists"],"award-info":[{"award-number":["Berta-Ottenstein-Programme for Clinician Scientists"]}],"id":[{"id":"10.13039\/501100021729","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100021729","name":"Faculty of Medicine, University of Freiburg","doi-asserted-by":"crossref","award":["Berta-Ottenstein-Programme for Clinician Scientists"],"award-info":[{"award-number":["Berta-Ottenstein-Programme for Clinician Scientists"]}],"id":[{"id":"10.13039\/501100021729","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:sec id=\"sec001\">\n<jats:title>Background<\/jats:title>\n<jats:p>Wide resection remains the cornerstone of localized soft-tissue sarcomas (STS) treatment. Neoadjuvant radiation therapy (NRT) may decrease the risk of local recurrences; however, its effectiveness for different histological STS subtypes has not been systematically investigated. The proposed prospective study evaluates the NRT response in STS using liquid biopsies and the correlation of multiparametric magnetic resonance imaging (mpMRI) with histopathology and immunohistochemistry.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec002\">\n<jats:title>Methods<\/jats:title>\n<jats:p>Patients with localized high-grade STS, who qualify for NRT, are included in this study.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec003\">\n<jats:title>Liquid biopsies<\/jats:title>\n<jats:p>Quantification of circulating tumor DNA (ctDNA) in patient blood samples is performed by targeted next-generation sequencing. Soft-tissue sarcoma subtype-specific panel sequencing in combination with patient-specific exome sequencing allows the detection of individual structural variants and point mutations. Circulating free DNA is isolated from peritherapeutically collected patient plasma samples and ctDNA quantified therein. Identification of breakpoints is carried out using FACTERA. Bioinformatic analysis is performed using samtools, picard, fgbio, and the MIRACUM Pipeline.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec004\">\n<jats:title>mpMRI<\/jats:title>\n<jats:p>Combination of conventional MRI sequences with diffusion-weighted imaging, intravoxel-incoherent motion, and dynamic contrast enhancement. Multiparametric MRI is performed before, during, and after NRT. We aim to correlate mpMRI data with the resected specimen\u2019s macroscopical, histological, and immunohistochemical findings.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec005\">\n<jats:title>Results<\/jats:title>\n<jats:p>Preliminary data support the notion that quantification of ctDNA in combination with tumor mass characterization through co-registration of mpMRI and histopathology can predict NRT response of STS.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec006\">\n<jats:title>Clinical relevance<\/jats:title>\n<jats:p>The methods presented in this prospective study are necessary to assess therapy response in heterogeneous tumors and lay the foundation of future patient- and tumor-specific therapy concepts. These methods can be applied to various tumor entities. Thus, the participation and support of a wider group of oncologic surgeons are needed to validate these findings on a larger patient cohort.<\/jats:p>\n<\/jats:sec>","DOI":"10.1371\/journal.pone.0285580","type":"journal-article","created":{"date-parts":[[2023,11,1]],"date-time":"2023-11-01T17:41:06Z","timestamp":1698860466000},"page":"e0285580","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":5,"title":["Non-invasive monitoring of neoadjuvant radiation therapy response in soft tissue sarcomas by multiparametric MRI and quantification of circulating tumor DNA\u2014A study 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