Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the stages of Merkel Cell Carcinoma ?
    ### Response:
    Key Points
                    - After Merkel cell carcinoma has been diagnosed, tests are done to find out if cancer cells have spread to other parts of the body.    - There are three ways that cancer spreads in the body.    - Cancer may spread from where it began to other parts of the body.
    