Below is an instruction from Human. Write a response.
    ### Instruction:
    How to prevent Liver (Hepatocellular) Cancer ?
    ### Response:
    Key Points
                    - Avoiding risk factors and increasing protective factors may help prevent cancer.    - The following risk factors may increase the risk of liver cancer:         - Hepatitis B and C     - Cirrhosis     - Aflatoxin        - The following protective factor may decrease the risk of liver cancer:         - Hepatitis B vaccine        - Cancer prevention clinical trials are used to study ways to prevent cancer.
    