Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to ovarian cancer ?
    ### Response:
    Cancers occur when a buildup of mutations in critical genesthose that control cell growth and division or repair damaged DNAallow cells to grow and divide uncontrollably to form a tumor. Most cases of ovarian cancer are sporadic; in these cases the associated genetic changes are acquired during a person's lifetime and are present only in certain cells in the ovary.
    