The lining of the uterus is called the endometrium.
Endometroid cancer is a specific type of endometrial cancer.
Cancer of the endometrium is different from cancer of the muscle of the uterus, which is called sarcoma of the uterus. A risk factor is anything that may increase a person's chance of developing a disease. It may be an activity, such as smoking, diet, family history, or many other things. Different diseases, including cancers, have different risk factors. Although these factors can increase a person's risk, they do not necessarily cause the disease.