Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Colon Cancer ?
    ### Response:
    Key Points
                    - Colon cancer is a disease in which malignant (cancer) cells form in the tissues of the colon.    - Health history affects the risk of developing colon cancer.    - Signs of colon cancer include blood in the stool or a change in bowel habits.
    