Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Anal Cancer ?
    ### Response:
    The anus is where stool leaves your body when you go to the bathroom. It is made up of your outer layers of skin and the end of your large intestine. Anal cancer is a disease in which cancer cells form in the tissues of the anus.    Anal cancer is rare. It is more common in smokers and people over 50.
    