NCT00969722 2013-03-08A Study of MAb-3F8 Plus Granulocyte-Macrophage Colony-Stimulating Factor (GM-CSF) Versus 13-cis-Retinoic Acid (RA) Plus GM-CSF in Primary Refractory Neuroblastoma PatientsUnited TherapeuticsPhase 2 Terminated1 enrolled