Cancer occurs when cells (the building blocks of the body) start to multiply out of control, forming a growth which can then spread to other tissues. A cancer that develops in the lining of the womb is known as endometrial cancer.The endometrium is the lining of the womb. The womb is the chamber in which pregnancies develop. The scientific name for the womb is the uterus.
See - What is endometrial cancer, by Consultant Gynaecologist, Miss Adeola Olaitan