Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Extragonadal Germ Cell Tumors ?
    ### Response:
    Key Points
                    - Extragonadal germ cell tumors form from developing sperm or egg cells that travel from the gonads to other parts of the body.    - Age and gender can affect the risk of extragonadal germ cell tumors.     - Signs and symptoms of extragonadal germ cell tumors include breathing problems and chest pain.
    