A total of @ patients enrolled in Children 's Oncology Group ( COG ) study D@ met the inclusion criteria for this analysis : ( @ ) non-metastatic , initially unresected ( Group III ) ; ( @ ) embryonal ( ERMS ) or alveolar ( ARMS ) histology ; ( @ ) documented protocol week @ response to induction chemotherapy ( excluding progressive disease ) based on anatomic imaging ( CT/MRI ) and ( @ ) documented protocol therapy beyond week @ .