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Syndrome reference sheet
Generated 12 Oct 2026
Immunology · Immunology / Immune dysregulation

APDS syndrome

Also known as: Activated PI3K delta syndrome

Combined immunodeficiency with lymphoproliferation.

Medical specialty
Immunology
Subspecialty
Immunology / Immune dysregulation
Sex & age distribution
Male: affected; Female: affected; Children: yes
Gene(s) involved
PIK3CD, PIK3R1

Etiology & mechanism

Gain-of-function PIK3CD or loss of PIK3R1.

Gene(s) involved (2)

PIK3CDPIK3R1

Symptoms & signs (3)

herpesvirus infectionslymphadenopathyrecurrent sinopulmonary infections
SyndromeScope — educational reference. Content is model-generated and not clinically verified; always confirm against OMIM, Orphanet and GeneReviews before clinical use.