The present invention describes the combination of cucurbitacin (CuB) with methotrexate (MTX) for the treatment of cancers, including osteosarcoma. It was discovered that CuB and MTX have synergistic activity against osteosarcoma, which reduces toxicities associated with both chemotherapeutic agents. The present invention also describes the use of CuB for the treatment of osteosarcoma.
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