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A malignant mesenchymal tumor composed of fibroblasts, and characterized by collagen production and a herringbone architectural pattern. It is more commonly seen in middle-aged and older adults. It usually affects the deep soft tissues of extremities, trunk, head and neck. Adult fibrosarcomas may recur and metastasise to the lungs and bones. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C7809\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C7809\' NCI Thesaurus)
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