Are they different from Ewing's sarcoma and primitive neuroectodermal tumor in children?

PURPOSE: To determine whether age at diagnosis influences the behavior of Ewing's sarcoma and primitive neuroectodermal tumor (PNET). PATIENTS AND METHODS: We reviewed the clinical features, treatment, and outcome of 59 consecutive patients with Ewing's sarcoma and PNET treated on the Adult Sarcoma Unit at our institution from 1980 to 1995. RESULTS: The 37 male and 22 female patients had a median age of 24 years.

Lower limb was the most common primary tumor site. Fifteen patients had nonmetastatic tumor less than 100-mL volume, 27 had nonmetastatic disease greater than 100-mL volume, and 17 had evidence of metastatic disease at presentation. The origin of the primary tumor was soft tissue in 28 cases, bone in 30, and uncertain in one.

The Kaplan-Meier estimate of 5-year overall survival (OS) in all patients was 38% and of progression-free survival (PFS), 27%. When patients with metastatic disease at presentation were excluded, these figures increased to 52% and 34%, respectively. ... more.

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