Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Childhood ovarian cancer ?
    ### Response:
    Childhood ovarian cancer is a rare type of cancer that occurs due to abnormal and uncontrolled cell growth in the ovaries. The childhood form, specifically, is extremely rare and accounts for less than 5% of all ovarian cancer cases. The most common types of ovarian cancers diagnosed in children and adolescents include germ cell tumors, followed by epithelial tumors, stromal tumors, and then other tumors (such as Burkitt lymphoma and small cell carcinoma of the ovary).
    