Open-label extension study of leniolisib in activated PI3Kδ syndrome: Long-term efficacy and safety

Long-term leniolisib was generally well tolerated in 37 patients with activated phosphoinositide 3-kinase delta syndrome treated for a median of 4.3 years. Annual infection rates (P = 0.0005), respiratory infection rates (P = 0.0017) and immunoglobulin replacement therapy use (P = 0.0095) all declined per year of treatment, with clinically meaningful gains in 36-Item Short Form Survey general health scores. This extends the efficacy and safety evidence for leniolisib in APDS well beyond the pivotal trials.