Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Endometrial Cancer ?
    ### Response:
    Key Points
                    - Endometrial cancer is a disease in which malignant (cancer) cells form in the tissues of the endometrium.     - In the United States, endometrial cancer is the most common invasive cancer of the female reproductive system.    -  Health history and certain medicines can affect the risk of developing endometrial cancer.
    