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Updated: Jun 6, 2025
Isolation and Characterization of Tumor-initiating Cells from Sarcoma Patient-derived Xenografts
Published on: June 13, 2019
Early separation and parallel clonal selection of dedifferentiated and well-differentiated components in
Tetsuya Sekita1, Naofumi Asano2, Takashi Kubo3
1Department of Clinical Genomics, National Cancer Center Research Institute, Tokyo, Japan; Department of Musculoskeletal Oncology, National Cancer Center Hospital, Tokyo, Japan; Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan.
Abstract:
Dedifferentiated liposarcoma (DDLPS) comprises a high-grade dedifferentiated (DD) component and a juxtaposed well-differentiated (WD) component. The DD component is believed to originate from the WD component by acquiring additional genomic alterations. In this study, we performed multiregion genome, epigenome, and transcriptome analyses of three patients with DDLPS. In two patients, there were few common genomic alterations across all samples, but many common alterations within DD or WD component samples. Phylogenetic trees predicted from the genomic alterations were consistent with those predicted from DNA methylation patterns. The expression patterns of adipogenesis-related genes differed between DD and WD components and also among patients in connection with their CpG island methylation status. These results indicate that in some patients, WD and DD components are evolutionarily separated at very early stages of tumorigenesis, and are formed through relatively long clonal selection with acquisition of different driver genomic alterations and DNA methylation changes.
