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• W2912990339 abstract "Leiomyosarcoma (LMS) is a soft tissue sarcoma characterized by multiple copy number alterations (CNAs) and without common recurrent single nucleotide variants. We evaluated the feasibility of detecting circulating tumor DNA (ctDNA) with next-generation sequencing in a cohort of patients with LMS whose tumor burden ranged from no evidence of disease to metastatic progressive disease.Cell-free DNA in plasma samples and paired genomic DNA from resected tumors were evaluated from patients with LMS by ultra-low passage whole genome sequencing (ULP-WGS). Sequencing reads were aligned to the human genome and CNAs identified in cell-free DNA and tumor DNA by ichorCNA software to determine the presence of ctDNA. Clinical data were reviewed to assess disease burden and clinicopathologic features.We identified LMS ctDNA in eleven of sixteen patients (69%) with disease progression and total tumor burden over 5 cm. Sixteen patients with stable disease or low disease burden at the time of blood draw were found to have no detectable ctDNA. Higher ctDNA fraction of total cell-free DNA was associated with increasing tumor size and disease progression. Conserved CNAs were found between primary tumors and ctDNA in each case, and recurrent CNAs were found across LMS samples. ctDNA levels declined following resection of progressive disease in one case and became detectable upon disease relapse in another individual patient.These results suggest that ctDNA, assayed by a widely available sequencing approach, may be useful as a biomarker for a subset of uterine and extrauterine LMS. Higher levels of ctDNA correlate with tumor size and disease progression. Liquid biopsies may assist in guiding treatment decisions, monitoring response to systemic therapy, surveying for disease recurrence and differentiating benign and malignant smooth muscle tumors." @default.
• W2912990339 created "2019-02-21" @default.
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• W2912990339 date "2019-12-01" @default.
• W2912990339 modified "2023-09-30" @default.
• W2912990339 title "Detection of Circulating Tumor DNA in Patients With Leiomyosarcoma With Progressive Disease" @default.
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• W2912990339 doi "https://doi.org/10.1200/po.18.00235" @default.
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