Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Endometrial Cancer ?
    ### Response:
    Tests that examine the endometrium are used to detect (find) and diagnose endometrial cancer. Because endometrial cancer begins inside the uterus, it does not usually show up in the results of a Pap test. For this reason, a sample of endometrial tissue must be removed and checked under a microscope to look for cancer cells.
    