Multimodal Treatment in Pelvic Ewing Sarcoma: A Prognostic Factor Analysis.

Background: Although multidisciplinary therapies have improved local control and overall survival in Ewing sarcoma (ES), the prognosis of pelvic lesions remains markedly worse than that of limb ES.

Methods: We retrospectively evaluated the influence of the type of local treatment, margins, necrosis and sacrum involvement on overall survival (OS) and disease-free survival (DFS) in a series of 21 non-metastatic pelvic ES.

Results: The average follow-up was 46.