Ewing sarcoma is a type of cancer that occurs in either the bones or soft tissues. Study doctors want to find better ways to detect, prevent, and treat Ewing sarcoma. To do this, they need samples of Ewing sarcoma tumors and some blood and bone marrow from people with these tumors. The goal of this study is to collect Ewing sarcoma tumor specimens and blood and bone marrow samples from patients with these tumors. These specimens will be used by researchers to increase our knowledge about how to diagnose and treat Ewing sarcomas.