- In emergent circumstances, COG-ANBL0531 protocol therapy may be initiated prior to enrollment on study as long as the patient has neuroblastoma by clinical diagnosis, all other COG-ANBL0531 eligibility criteria are met, and the COG-ANBL0531 Initial Therapy consent has been signed prior to starting protocol therapy; in this circumstance ANBL0531 enrollment must occur within 4 working days of starting protocol therapy