GYNECOLOGICAL CANCER GUIDE: ENDOMETRIAL SARCOMA
Posted: under Cancer.
Sarcomas are cancers that arise from the muscle of the wall of the uterus. They can be ‘pure’ – these cancers arise from muscle cells only, and are labeled ‘leiomyosarcomas’. In contrast, especially in older women, mixed sarcomas are common and have a combination of glandular cancers, just as in endometrial cancer, and cancers of the uterine muscle wall. These are called ‘mixed mesodermal tumours’.There are no known predisposing factors involved in the development of cancer in the muscle of the uterus (uterine sarcomas).The most common type of uterine sarcoma (leiomyosarcomas) usually arises in fibroids. Fibroids that are benign tumours (do not contain cancerous cells) arise from the muscle of the wall of the uterus and are extremely common, being present in up to 50% of women between the ages of 40 and 50. They may enlarge the uterus and cause pain but are still benign. The estimated risk of fibroids turning malignant into cancer is estimated between one in eight hundred and one in one thousand.Uterine sarcomas are more aggressive than cancers that arise in the lining of the uterus and are more likely to spread by the blood stream so that secondary cancers in the lung are the most common presentation of recurrent or advanced disease.There is a more rare form of uterine sarcoma called an ‘endometrial stromal sarcoma’, which arises from the tissue in between the glands of the lining of the uterus itself- the so-called ‘stroma’. These are usually low-grade cancers and are often removed by hysterectomy and are sensitive to hormonal treatment.If a uterine sarcoma is not treated, then it can spread by the blood stream to lungs, liver and bone.*3/144/5*