Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the stages of Childhood Extracranial Germ Cell Tumors ?
    ### Response:
    Key Points
                    - After a childhood extracranial germ cell tumor has been diagnosed, tests are done to find out if cancer cells have spread from where the tumor started to nearby areas or to other parts of the body.     - There are three ways that cancer spreads in the body.
    