Table 1.

Staging for uterine sarcoma (leiomyosarcomas, endometrial stromal sarcomas, adenosarcomas, and carcinosarcomas).

Stage	Definition
(1) Leiomyosarcoma
I	Tumor limited to uterus
IA	<5 cm
IB	>5 cm
II	Tumor extends to the pelvis
IIA	Adnexal involvement
IIB	Tumor extends to the extrauterine pelvic tissue
III	Tumor invades abdominal tissue (not just protruding into the abdomen)
IIIA	One site
IIIB	>one site
IIIC	Metastases to pelvic and/or para-aortic lymph nodes
IV
IVA	Tumor invades bladder and/or rectum
IVB	Distant metastases
(2) Endometrial stromal sarcomas (ESS) and adenosarcomas∗
I
IA	Tumor limited to uterus
IB	Tumor limited to the endometrium/endocervix no myometrial invasion
IC	More than half myometrial invasion
II	Tumor extends to the pelvis
IIA	Adnexal involvement
IIB	Tumor extends to the extrauterine pelvic tissue
	Tumor extends to the extrauterine pelvic tissue
III	Tumor invades abdominal tissue (not just protruding into the abdomen)
IIIA	One site
IIIB	>one site
IIIC	Metastases to pelvic and/or para-aortic lymph nodes
IV
IVA	Tumor invades bladder and/or rectum
IVB	Distant metastases
(3) Carcinosarcomas
Carcinomas should be staged as carcinomas of the endometrium

*Note: simultaneous tumors of the uterine corpus and ovary/pelvis in association with ovarian/pelvic endometriosis should be classified as independent primary tumors (from  [11]).