Below is an instruction from Human. Write a response.
    ### Instruction:
    What is the outlook for Osteosarcoma and Malignant Fibrous Histiocytoma of Bone ?
    ### Response:
    Certain factors affect prognosis (chance of recovery) and treatment options. The prognosis (chance of recovery) is affected by certain factors before and after treatment.    The prognosis of untreated osteosarcoma and MFH depends on the following:         - Where the tumor is in the body and whether tumors formed in more than one bone.
    