A Study of Codrituzumab in Children and Young Adults With Solid Tumors and Have Not Responded to Treatment or Have Come Back After Treatment

For Phase A (Dose Escalation), the starting dose (dose level 1) will be 10 mg/kg with 1 planned dose escalation to 20 mg/kg (dose level 2) if dose level 1 is determined to be safe and tolerable. Once a RP2D/MTD is identified in Phase A, then Phase B (hepatoblastoma expansion cohort) will open and allow for enrollment of up to 10 additional patients.For both phases, patients will receive codrituzumab IV once per week for a period of 21 days per cycle. Patients will be eligible for up to 25 cycles.