Prognostic factors for patients with Ewing sarcoma (EWS) at first recurrence following multi-modality therapy: A report from the children's oncology group

Patrick J. Leavey, Leo Mascarenhas, Neyssa Marina, Zhengjia Chen, Mark Krailo, James Miser, Ken Brown, Nancy Tarbell, Mark L. Bernstein, Linda Granowetter, Mark Gebhardt, Holcombe E. Grier