Overview
Chronic neutrophilic leukemia (CNL) is a rare myeloproliferative neoplasm characterized by persistent neutrophilia without significant increase in granulocytic precursors, often presenting in middle-aged and elderly individuals 1.Diagnosis
Key Criteria: Total leukocyte count ≥25 × 109/L, ≥80% mature neutrophils, ≥10% immature granulocytes in peripheral blood, hypercellular marrow 1.
Exclusion Criteria: Absence of dysplasia, monocytosis, BCR-ABL1, PDGFR-A, PDGFR-B, or FGFR1 rearrangements, and exclusion of other myeloproliferative disorders or physiologic causes 1.
Genetic Testing: CSF3R gene mutations (e.g., T618I) can aid in diagnosis 2.Management
First-Line Treatment: No specific first-line treatment universally recommended; management often focuses on symptom control and complications 12.
Adjunctive Treatments: Management may include supportive care for complications such as severe bleeding; specific drug classes and doses not detailed in abstracts 2.Special Populations
Comorbidities: Severe bleeding complications noted in patients with CSF3R mutations 2.
Presentation Variants: Can present atypically, such as secondary gout 1.Key Recommendations
Confirm diagnosis using criteria including leukocyte count, neutrophil percentage, immature granulocyte presence, and exclusion of other conditions (Evidence: Expert opinion 1).
Consider CSF3R gene mutation analysis for accurate diagnosis and understanding of bleeding risk (Evidence: Weak 2).
Focus on managing complications and supportive care due to limited specific therapeutic options (Evidence: Expert opinion 12).References
1 Kakkar N, Joseph John M. Chronic neutrophilic leukemia presenting as secondary gout: Report of a rare myeloproliferative disorder. Indian journal of cancer 2020. link
2 Mitsumori T, Komatsu N, Kirito K. A CSF3R T618I Mutation in a Patient with Chronic Neutrophilic Leukemia and Severe Bleeding Complications. Internal medicine (Tokyo, Japan) 2016. link