Outcome and prognostic factors in endometrial stromal tumors: a Rare Cancer Network study.

Purpose: To provide further understanding regarding outcome and prognostic factors of endometrial stromal tumors (EST).

Methods And Materials: A retrospective analysis was performed on the records of 59 women diagnosed with EST and treated with curative intent between 1983 and 2007 in the framework of the Rare Cancer Network.

Results: Endometrial stromal sarcomas (ESS) were found in 44% and undifferentiated ESS (UES) in 49% of the cases.