The ESID-EHA-SIOP Symposium brings together leading experts in immunology, hematology, and pediatric oncology to exchange knowledge about the latest advances in the diagnosis and treatment of immune-mediated and hematologic disorders. The symposium promotes interdisciplinary collaboration and the sharing of experiences, with a strong focus on applying scientific innovations in clinical practice. It also serves as an important platform for presenting the latest research, clinical experiences, and future directions in improving patient care.