Disorders of neutrophil number and function

Area of Science:

• Immunology
• Hematology
• Genetics

Background:

• Neutrophil disorders significantly impact patient health and treatment strategies.
• Recent research has yielded critical insights into the natural history and therapeutic interventions for these conditions.

Purpose of the Study:

• To review significant research advancements in neutrophil number and function disorders.
• To present a clinical diagnostic approach for phagocyte disorders.
• To discuss two key recent developments: natural history of severe chronic neutropenia and gene therapy for chronic granulomatous disease.

Main Methods:

• Review of data from the Severe Chronic Neutropenia International Registry.
• Analysis of a multinational gene therapy trial for chronic granulomatous disease.
• Synthesis of current literature on neutrophil disorders and diagnostic evaluation.

Main Results:

• A large cohort study quantified risks of sepsis, myelodysplastic syndrome, and acute myeloid leukemia in severe chronic neutropenia patients treated with granulocyte colony-stimulating factor.
• Successful gene therapy for chronic granulomatous disease was reported, but raised concerns regarding retroviral insertion sites and potential leukemogenesis.
• A pragmatic diagnostic approach for suspected neutrophil disorders is outlined.

Conclusions:

• Advances in understanding severe chronic neutropenia provide crucial data for risk stratification and management.
• Gene therapy for chronic granulomatous disease shows promise but requires careful long-term monitoring for safety.
• The review offers a practical framework for diagnosing and managing patients with neutrophil disorders.