- Prior to enrollment on ANBL0931, a determination of residual disease must be performed (tumor imaging studies including metaiodobenzylguanidine [MIBG] scan, computed tomography [CT] or magnetic resonance imaging [MRI], bone marrow aspiration and biopsy); this disease assessment is required for eligibility, and should be done preferably within 2 weeks but must be done within a maximum of 4 weeks before enrollment