Liquid Biopsy in Ewing Sarcoma and Osteosarcoma as a Prognostic And Response Diagnostic: LEOPARD

Conditions: Ewing Sarcoma; Ewing Sarcoma of Bone; Ewing Sarcoma of Soft Tissue; Peripheral Primitive Neuroectodermal Tumor; Peripheral Primitive Neuroectodermal Tumor of Bone; Peripheral Primitive Neuroectodermal Tumor of Soft Tissue; High-grade Osteosarcoma Interventions: Other: FoundationOne Liquid CDx Sponsors: Dana-Farber Cancer Institute; Alex ' s Lemonade Stand Foundation; Conquer Cancer Foundation; Harvard University; Sam Day Foundation Recruiting
Source: ClinicalTrials.gov - Category: Research Source Type: clinical trials