A Case of Anti-NMDA Receptor Encephalitis During Dinutuximab Therapy for Neuroblastoma.

Dinutuximab is a monoclonal antibody administered to patients with high-risk neuroblastoma, usually after an autologous stem cell transplant. Dinutuximab is associated with immune mediated and neurologic toxicities, but fatal adverse events are rare. A case is presented of high-risk neuroblastoma with development of encephalopathy shortly after the first course of dinutuximab. The patient had extensive evaluation for etiology of the symptoms and received aggressive interventions, but ultimately expired. Postmortem diagnosis of anti-N-methyl D-aspartate receptor encephalitis, an autoimmune phenomenon often triggered by infection or malignancy, was made. The potential association of autoimmune encephalitis with dinutuximab and with previous autologous transplant is discussed.