PARIS--(BUSINESS WIRE)--Cytheris SA, a clinical stage biopharmaceutical company focused on research and development of new therapies for immune modulation, today announced the initiation of a Phase I/IIa clinical trial of IL-7 in support of tumor lysate/KLH pulsed dendritic cell vaccines in a pilot study of tumor vaccination in patients with metastatic or recurrent pediatric solid tumors and altered T cell homeostasis, including patients with Ewing’s sarcoma family of tumors (ESFT), rhabdomyosarcoma, neuroblastoma, synovial cell sarcoma, desmoplastic small round cell tumor, undifferentiated sarcoma, and embryonal sarcoma.