Clinical spectrum and features of activated phosphoinositide 3-kinase δ syndrome: A large patient cohort study

Tanya I Coulter, Anita Chandra, Chris M Bacon, Judith Babar, James Curtis, Nick Screaton, John R Goodlad, George Farmer, Cathal Laurence Steele, Timothy Ronan Leahy, Rainer Doffinger, Helen Baxendale, Jolanta Bernatoniene, J David M Edgar, Hilary J Longhurst, Stephan Ehl, Carsten Speckmann, Bodo Grimbacher, Anna Sediva, Tomas MilotaSaul N Faust, Anthony P Williams, Grant Hayman, Zeynep Yesim Kucuk, Rosie Hague, Paul French, Richard Brooker, Peter Forsyth, Richard Herriot, Caterina Cancrini, Paolo Palma, Paola Ariganello, Niall Conlon, Conleth Feighery, Patrick J Gavin, Alison Jones, Kohsuke Imai, Mohammad A A Ibrahim, Gašper Markelj, Mario Abinun, Frédéric Rieux-Laucat, Sylvain Latour, Isabelle Pellier, Alain Fischer, Fabien Touzot, Jean-Laurent Casanova, Anne Durandy, Siobhan O Burns, Sinisa Savic, D S Kumararatne, Despina Moshous, Sven Kracker, Bart Vanhaesebroeck, Klaus Okkenhaug, Capucine Picard, Sergey Nejentsev, Alison M Condliffe, Andrew James Cant

Research output: Contribution to journalArticleAcademicpeer-review

320 Citations (Scopus)

Abstract

BACKGROUND: Activated phosphoinositide 3-kinase δ syndrome (APDS) is a recently described combined immunodeficiency resulting from gain-of-function mutations in PIK3CD, the gene encoding the catalytic subunit of phosphoinositide 3-kinase δ (PI3Kδ).

OBJECTIVE: We sought to review the clinical, immunologic, histopathologic, and radiologic features of APDS in a large genetically defined international cohort.

METHODS: We applied a clinical questionnaire and performed review of medical notes, radiology, histopathology, and laboratory investigations of 53 patients with APDS.

RESULTS: Recurrent sinopulmonary infections (98%) and nonneoplastic lymphoproliferation (75%) were common, often from childhood. Other significant complications included herpesvirus infections (49%), autoinflammatory disease (34%), and lymphoma (13%). Unexpectedly, neurodevelopmental delay occurred in 19% of the cohort, suggesting a role for PI3Kδ in the central nervous system; consistent with this, PI3Kδ is broadly expressed in the developing murine central nervous system. Thoracic imaging revealed high rates of mosaic attenuation (90%) and bronchiectasis (60%). Increased IgM levels (78%), IgG deficiency (43%), and CD4 lymphopenia (84%) were significant immunologic features. No immunologic marker reliably predicted clinical severity, which ranged from asymptomatic to death in early childhood. The majority of patients received immunoglobulin replacement and antibiotic prophylaxis, and 5 patients underwent hematopoietic stem cell transplantation. Five patients died from complications of APDS.

CONCLUSION: APDS is a combined immunodeficiency with multiple clinical manifestations, many with incomplete penetrance and others with variable expressivity. The severity of complications in some patients supports consideration of hematopoietic stem cell transplantation for severe childhood disease. Clinical trials of selective PI3Kδ inhibitors offer new prospects for APDS treatment.

Original languageEnglish
Pages (from-to)597-606.e4
JournalJournal of allergy and clinical immunology
Volume139
Issue number2
DOIs
Publication statusPublished - Feb 2017
Externally publishedYes

Keywords

  • Adolescent
  • Adult
  • Animals
  • Antibiotic Prophylaxis
  • Child
  • Child, Preschool
  • Class I Phosphatidylinositol 3-Kinases/antagonists & inhibitors
  • Cohort Studies
  • Enzyme Inhibitors/therapeutic use
  • Female
  • Hematopoietic Stem Cell Transplantation
  • Herpesviridae Infections/genetics
  • Humans
  • Immunoglobulins, Intravenous/therapeutic use
  • Immunologic Deficiency Syndromes/genetics
  • Infant
  • International Cooperation
  • Lymphoproliferative Disorders/genetics
  • Male
  • Mice
  • Middle Aged
  • Mutation/genetics
  • Recurrence
  • Respiratory Tract Infections/genetics
  • Surveys and Questionnaires
  • Survival Analysis
  • Young Adult

Cite this