Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Familial prostate cancer ?
    ### Response:
    Familial prostate cancer is a cluster of prostate cancer within a family. Most cases of prostate cancer occur sporadically in people with no family history of the condition. However, approximately 5% to 10% of prostate cancer cases are believed to be primarily caused by a genetic predisposition to the condition.
    