<prompt> High dose methotrexate is used for the treatment ofREPEATOsteosarcomaRhabdomyosarcomaRetinoblastomaEwings sarcoma  <response>: Ref: Harrisons 17th612 Drugs used for osteosarcoma are: Doxorubicin Ifosfamide Cisplatin High dose methotrexate with leucovorin 