Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Ovarian carcinosarcoma ?
    ### Response:
    Ovarian carcinosarcoma is a cancer of the ovary that is composed of two types of cells, namely carcinoma cells and sarcoma cells.  Ovarian carcinosarcoma is also known as a malignant mixed mullerian tumor of the ovary.  The average age of women at the time of diagnosis is 60 to 70 years.
    