IMMUNOTHERAPY WITH ANTI-GD2 MONOCLONAL ANTIBODIES IN HIGH-RISK NEUROBLASTOMA PATIENTS ON AN OUTPATIENT BASIS

Neuroblastoma (NB) is the most common extracranial solid tumor in childhood. Prior to the introduction of intensive multimodal therapy, overall survival (OS) in patients with high-risk NB was below 15%. The addition of immunotherapy with dinutuximab beta in post-consolidation to multimodal treatment can increase the 5-year event-free survival rate for patients with high-risk NB up to 56.6%, and the 5-year OS up to 73.2%. The purpose of the research was to study the efficacy and safety of dinutuximab beta therapy in high-risk NB patients. Materials and methods used: the study included 8 pediatric patients with high-risk NB who had been treated with dinutuximab beta immunotherapy during postconsolidation on the basis of the Morozov Children’s City Clinical Hospital (Moscow, Russia) in 2020 to 2022. In case a patient's vital parameters normalization coupled with the absence of the need for accompanying therapy for 24 hours in a hospital, the patient was then considered as a candidate for outpatient treatment with possible no need for admission in the hospital. Results: 6 patients (75%) completed the full course of therapy with dinutuximab beta. The course of immunotherapy was not completed in 2 patients due to further progression of the disease. The most common adverse events were recorded as follows: pain (100%), fever (100%), diarrhea (62.5%), edematous syndrome (37.5%), allergic reactions (25%), hematological toxicity (25%). The period of time to becoming the candidates for outpatient treatment was 10.38±2.56 days for the 1st cycle of therapy and 2.67±1.63 days for the last, 5th cycle of the immunotherapy. In 6 out of 8 cases described the immunotherapy with dinutuximab beta allowed maintaining the response to treatment achieved after the end of consolidation preventing further development of the disease. The overall good tolerance to the drug made it possible to carry out the immunotherapy on an outpatient basis using microinfusing pump. Conclusion: an adequate route of administration and accompanying treatment make dinutuximab beta toxicity profile sufficient for outpatient management of patients with high-risk NB.