128P Non-uterine VS uterine leiomyosarcoma: A SEER based population study

Leiomyosarcoma (LS) is a common soft tissue sarcoma, with an incidence between 10% - 20%. Two subgroups can be distinguished, Non-Uterine Leiomyosarcoma (NULMS) and Uterine leiomyosarcoma (ULS). ULS is a rare gynecologic tumor with a poor prognosis. This study compares the characteristics, survival, and risk of multiple primary malignancies (MPM) in both groups to optimize management and advance research.