This educational webinar brings together experts from patient advocacy, clinical practice, and regulatory policy to explore the evolving landscape of secondary immunodeficiency (SID), with a focus on secondary hypogammaglobulinemia, an acquired antibody deficiency characterized by low immunoglobulin levels that can leave patients vulnerable to serious infections and other complications. As evidence continues to evolve, ongoing dialogue among clinicians, researchers, regulators, patients, and other stakeholders is essential to supporting patient-centered care and informed decision-making. Panelists: Dr. James Knowles, Vice President, Global Regulatory Policy & Scientific Affairs, PPTA Caroline Voltz-Girolt, Scientific Lead, Oncology and Hematology Office, European Medicines Agency (EMA) Charlene Grabowski, Patient and Board Member, Immune Deficiency Foundation (IDF) Dr. Stephan Grupp, Pediatric Hematologist / Oncologist, Children's Hospital of Philadelphia (CHOP)