Severe Combined Immunodeficiency: A Case Series and Review from a Tertiary Pediatric Hospital

Area of Science:

• Immunology
• Pediatrics
• Genetics

Background:

• Severe combined immunodeficiency (SCID) is a life-threatening genetic disorder impairing cellular and humoral immunity, leading to early infant death from infections.
• SCID presents with recurrent infections and failure to thrive, necessitating timely intervention.
• Hematopoietic stem cell transplantation is the definitive treatment, with outcomes significantly improved when performed before severe infections develop.

Purpose of the Study:

• To describe the clinical manifestations, laboratory data, and outcomes of 10 SCID patients treated at a children's hospital in Tehran, Iran.
• To emphasize the critical need for early diagnosis and referral in SCID management.
• To analyze the immunological profiles of SCID patients.

Main Methods:

• Retrospective review of 10 SCID patients (2006-2013) including clinical data, family history, and treatment outcomes.
• Flow cytometric analysis to determine T cell, B cell, and natural killer (NK) cell populations.
• Evaluation of patient demographics, age at diagnosis, and presenting infections.

Main Results:

• The mean age at SCID diagnosis was 131.8 days.
• Seven patients received BCG vaccination before diagnosis, with three developing disseminated BCG infection.
• Flow cytometry revealed diverse immunophenotypes, including T⁻B⁺NK⁻, T⁻B⁻NK⁺, T⁻B⁻NK⁻, and T⁻B⁺NK⁺.

Conclusions:

• Early diagnosis and prompt referral are vital for improving outcomes in SCID patients.
• Timely hematopoietic stem cell transplantation before severe infections is essential for SCID treatment success.
• Understanding SCID immunophenotypes aids in diagnosis and management strategies.