?:definition
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A squamous cell carcinoma that has metastasized to the neck region from an unknown primary anatomic site. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C7713\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C7713\' NCI Thesaurus)
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