Core Viewpoint - Pharming Group N.V. announced that the FDA has accepted its supplemental New Drug Application for leniolisib, aimed at treating children aged 4 to 11 years with activated phosphoinositide 3-kinase delta syndrome (APDS), with a target action date of January 31, 2026 [1][7]. Group 1: FDA Approval Process - The supplemental New Drug Application is based on positive results from a Phase III study showing improvements in lymphadenopathy and naïve B cells over 12 weeks [2]. - The FDA has granted Priority Review status to the application, indicating that the treatment could offer significant improvements in effectiveness or safety for serious conditions [3]. Group 2: Disease Background - APDS is a rare primary immunodeficiency characterized by immune dysregulation and recurrent infections, often leading to severe complications such as lung damage and lymphoma [5]. - The condition affects approximately 1 to 2 individuals per million globally, and patients often experience a median diagnostic delay of 7 years [5]. Group 3: Treatment Details - Leniolisib is an oral PI3Kδ inhibitor, previously approved for patients aged 12 and older, and is the first targeted treatment for APDS [6][4]. - The drug has shown statistically significant improvements in clinical trials, and its safety and tolerability have been supported by long-term data [6]. Group 4: Future Developments - Leniolisib is currently under regulatory review in multiple regions, including the European Economic Area, Japan, and Canada, for its use in APDS [6]. - The company is also evaluating leniolisib in additional clinical trials for other primary immunodeficiencies with immune dysregulation [8].

Core Insights - Pharming Group N.V. is presenting Phase III clinical data for leniolisib, targeting pediatric patients aged 4-11 years with activated phosphoinositide 3-kinase delta (PI3Kδ) syndrome (APDS) at the 2025 Annual Meeting of the Clinical Immunology Society [1][2] Presentations - The presentation titled "Primary and Safety Outcomes of a Phase 3 Open-Label, Single-Arm, 12-Week Study of Treatment With PI3Kδ Inhibitor Leniolisib in Pediatric Patients Aged 4-11 Years With Activated PI3Kδ Syndrome (APDS)" will be led by Dr. Shanmuganathan Chandrakasan on May 2, 2025 [2] - Additional presentations include a systematic literature review on immune dysregulation in common variable immunodeficiency and insights into APDS from patient perspectives [2] About Leniolisib - Leniolisib is an oral small molecule PI3Kδ inhibitor approved in several countries as the first targeted treatment for APDS in patients aged 12 and older [3] - The drug has shown statistically significant improvement in co-primary endpoints in a Phase III clinical trial, indicating a favorable impact on immune dysregulation [3] - Leniolisib is under regulatory review in the European Economic Area, Canada, and other regions, with plans for approval in Japan [3] About Pharming Group N.V. - Pharming Group N.V. is a global biopharmaceutical company focused on developing innovative medicines for rare and life-threatening diseases [4] - The company is headquartered in Leiden, the Netherlands, and operates in over 30 markets worldwide [4]