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Table 1 Clinical characteristics of APDS 1 and APDS 2 reported in the literature and manifestations of these conditions in our patients [1, 3, 5, 7, 11]

From: Activated phosphoinositide 3-kinase delta syndrome 1 and 2 (APDS 1 and APDS 2): similarities and differences based on clinical presentation in two boys

Manifestation

APDS 1

APDS 2

Typical symptoms

Symptoms in the patient 1

Typical symptoms

Symptoms in the patient 2

Infectious complications

 

 Recurrent respiratory infections

  Pneumonia

+

+

+

+

  Bronchitis

+

+

+

+

  Sinusitis

+

+

+

+

  Otitis

+

+

+

 Viral infections

  HPV

+

+

  CMV

+

+

+

  EBV

+

+

  Adenovirus

+

+

 Parasitic and fungal infections

+

+

+

 Gastrointestinal infections

+

+

Non-infectious complications

 

 Lymphadenopathy

+

+

+

+

 Splenomegaly

+

+

+

 Hepatomegaly

+

+

+

 Nodular lymphoid hyperplasia in the gastrointestinal tract

+

+

+

 Signs of facial dysmorphia

+

+

 Short stature

+

+

 Intellectual disability

+

 Microcephalia

+

Mutation

 

 E1021K

+

+

 N334K

+

 E525K

+

 C416R

+

 NM_181523

+

+

Laboratory abnormalities

 

 Lower concentrations of IgG and IgA

+

+

+

+

 Elevated concentration of IgM

+

+

+

 Lymphopenia CD19+

+

+

+

+

 Elevated count of T lymphocytes CD8+

+

+

+

 Inverted CD4/CD8 ratio

+

+

+

+

 Lower count of naïve T lymphocytes CD4+ (CD4+CD45RA+)

+

+

+

 Lower count of naïve T lymphocytes CD8+ (CD8+CD45RA+)

+

Treatment

 

 Immunoglobulin replacement therapy

+

+

+

+

 Immunosuppressive therapy

+

+

 Allo-HSCT

+

+

+