Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Liver (Hepatocellular) Cancer ?
    ### Response:
    Key Points
                    - Liver cancer is a disease in which malignant (cancer) cells form in the tissues of the liver.    - Liver cancer is less common in the United States than in other parts of the world.    - Having hepatitis or cirrhosis can increase the risk of developing liver cancer.
    