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Continue to ChatEfficacy of sorafenib in heavily pretreated adult patients with metastatic osteosarcoma. - https://avesis.istanbul.edu.tr/yayin/c2a343f7-d29e-4242-86b6-af2e96b679b0/efficacy-of-sorafenib-in-heavily-pretreated-adult-patients-with-metastatic-osteosarcoma