Below is an instruction from Human. Write a response.
    ### Instruction:
    What is the outlook for Ewing Sarcoma ?
    ### Response:
    Certain factors affect prognosis (chance of recovery). The factors that affect prognosis (chance of recovery) are different before and after treatment.    Before treatment, prognosis depends on:         - Whether the tumor has spread to lymph nodes or distant parts of the body.
    