The reprogramming of a patient’s immune system through genetic modification of the T cell compartment with chimeric antigen receptors (CARs) has led to durable remissions in chemotherapy-refractory B cell cancers. Targeting of solid cancers by CAR-T cells is dependent on their infiltration and expansion within the tumor microenvironment, and thus far, fewer clinical responses have been reported. Here, we report a phase 1 study (NCT02761915) in which we treated 12 children with relapsed/refractory neuroblastoma with escalating doses of second-generation GD2-directed CAR-T cells and increasing intensity of preparative lymphodepletion. Overall, no patients had objective clinical response at the evaluation point +28 days after CAR-T cell infusion using standard radiological response criteria. However, of the six patients receiving ≥108/meter2 CAR-T cells after fludarabine/cyclophosphamide conditioning, two experienced grade 2 to 3 cytokine release syndrome, and three demonstrated regression of soft tissue and bone marrow disease. This clinical activity was achieved without on-target off-tumor toxicity. Targeting neuroblastoma with GD2 CAR-T cells appears to be a valid and safe strategy but requires further modification to promote CAR-T cell longevity.

Neuroblastoma is the most common extracranial solid tumour in children, accounting for 15% of all paediatric cancer deaths. High-risk neuroblastoma is a particularly challenging-to-treat form of disease that requires multimodality treatment, consisting of chemotherapy, surgery, high-dose chemotherapy with autologous haematopoietic stem cell rescue, radiotherapy and differentiation therapy. However, despite intense multimodal treatment regimens, the prognosis for this patient population remains poor. In recent years, immunotherapy with anti-disialoganglioside 2 (anti-GD2) antibodies was found to improve survival rates for patients with high-risk neuroblastoma. Based on studies led by the SIOPEN (International Society of Paediatric Oncology European Neuroblastoma) group, the anti-GD2 antibody dinutuximab beta was approved for use in high-risk neuroblastoma by the European Medicines Agency and has been implemented into the standard of care in many countries across Europe. However, immunotherapy with dinutuximab beta is associated with a number of adverse events that may be challenging for clinicians, such as pain, fever, hypersensitivity reactions and capillary leak syndrome. While these adverse events are considered manageable, there are currently no formal guidelines to support clinicians with their management. The aim of this article is to discuss the management of the most common adverse events encountered in clinical practice and to provide practical guidance to assist clinicians in minimising toxicity associated with dinutuximab beta. Key PointsDinutuximab beta can cause adverse events that warrant consideration and management.Most common adverse events include pain, fever, allergy and capillary leak syndrome.Practical guidance is provided on the management of the most common adverse events.

This study contributes much to the emerging description of practice guidance and informs strategies that can be used by children and parents.