RT Journal Article T1 Disease Evolution and Response to Rapamycin in Activated Phosphoinositide 3-Kinase δ Syndrome: The European Society for Immunodeficiencies-Activated Phosphoinositide 3-Kinase δ Syndrome Registry. A1 Maccari, Maria Elena A1 Abolhassani, Hassan A1 Aghamohammadi, Asghar A1 Aiuti, Alessandro A1 Aleinikova, Olga A1 Bangs, Catherine A1 Baris, Safa A1 Barzaghi, Federica A1 Baxendale, Helen A1 Buckland, Matthew A1 Burns, Siobhan O A1 Cancrini, Caterina A1 Cant, Andrew A1 Cathebras, Pascal A1 Cavazzana, Marina A1 Chandra, Anita A1 Conti, Francesca A1 Coulter, Tanya A1 Devlin, Lisa A A1 Edgar, J David M A1 Faust, Saul A1 Fischer, Alain A1 Garcia-Prat, Marina A1 Hammarström, Lennart A1 Heeg, Maximilian A1 Jolles, Stephen A1 Karakoc-Aydiner, Elif A1 Kindle, Gerhard A1 Kiykim, Ayca A1 Kumararatne, Dinakantha A1 Grimbacher, Bodo A1 Longhurst, Hilary A1 Mahlaoui, Nizar A1 Milota, Tomas A1 Moreira, Fernando A1 Moshous, Despina A1 Mukhina, Anna A1 Neth, Olaf A1 Neven, Benedicte A1 Nieters, Alexandra A1 Olbrich, Peter A1 Ozen, Ahmet A1 Pachlopnik-Schmid, Jana A1 Picard, Capucine A1 Prader, Seraina A1 Rae, William A1 Reichenbach, Janine A1 Rusch, Stephan A1 Savic, Sinisa A1 Scarselli, Alessia A1 Scheible, Raphael A1 Sediva, Anna A1 Sharapova, Svetlana O A1 Shcherbina, Anna A1 Slatter, Mary A1 Soler-Palacin, Pere A1 Stanislas, Aurelie A1 Suarez, Felipe A1 Tucci, Francesca A1 Uhlmann, Annette A1 van-Montfrans, Joris A1 Warnatz, Klaus A1 Williams, Anthony Peter A1 Wood, Phil A1 Kracker, Sven A1 Condliffe, Alison Mary A1 Ehl, Stephan K1 PIK3CD K1 PIK3R1 K1 activated phosphoinositide 3-kinase δ syndrome K1 natural history K1 rapamycin K1 registry AB Activated phosphoinositide 3-kinase (PI3K) δ Syndrome (APDS), caused by autosomal dominant mutations in PIK3CD (APDS1) or PIK3R1 (APDS2), is a heterogeneous primary immunodeficiency. While initial cohort-descriptions summarized the spectrum of clinical and immunological manifestations, questions about long-term disease evolution and response to therapy remain. The prospective European Society for Immunodeficiencies (ESID)-APDS registry aims to characterize the disease course, identify outcome predictors, and evaluate treatment responses. So far, 77 patients have been recruited (51 APDS1, 26 APDS2). Analysis of disease evolution in the first 68 patients pinpoints the early occurrence of recurrent respiratory infections followed by chronic lymphoproliferation, gastrointestinal manifestations, and cytopenias. Although most manifestations occur by age 15, adult-onset and asymptomatic courses were documented. Bronchiectasis was observed in 24/40 APDS1 patients who received a CT-scan compared with 4/15 APDS2 patients. By age 20, half of the patients had received at least one immunosuppressant, but 2-3 lines of immunosuppressive therapy were not unusual before age 10. Response to rapamycin was rated by physician visual analog scale as good in 10, moderate in 9, and poor in 7. Lymphoproliferation showed the best response (8 complete, 11 partial, 6 no remission), while bowel inflammation (3 complete, 3 partial, 9 no remission) and cytopenia (3 complete, 2 partial, 9 no remission) responded less well. Hence, non-lymphoproliferative manifestations should be a key target for novel therapies. This report from the ESID-APDS registry provides comprehensive baseline documentation for a growing cohort that will be followed prospectively to establish prognostic factors and identify patients for treatment studies. PB Frontiers Research Foundation SN 1664-3224 YR 2018 FD 2018-03-16 LK http://hdl.handle.net/10668/12286 UL http://hdl.handle.net/10668/12286 LA en NO Maccari ME, Abolhassani H, Aghamohammadi A, Aiuti A, Aleinikova O, Bangs C, et al. Disease Evolution and Response to Rapamycin in Activated Phosphoinositide 3-Kinase δ Syndrome: The European Society for Immunodeficiencies-Activated Phosphoinositide 3-Kinase δ Syndrome Registry. Front Immunol. 2018 Mar 16;9:543. DS RISalud RD Apr 11, 2025