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Myelomonocytic leukemia

Last edited: 4/15/2026

Overview

Subacute myelomonocytic leukemia (SMML) is a myelodysplastic/myeloproliferative neoplasm characterized by dysregulated proliferation of monocytic and myeloid cells. It often evolves from a preleukemic phase, which can manifest with symptoms like pruritus and skin nodules preceding overt leukemia 1.

Diagnosis

  • Clinical Presentation: Pruritic symptoms and nonspecific skin lesions may precede diagnosis by several years 1.
  • Laboratory Tests: Elevated white blood cell count with monocytic predominance, dysplastic features on bone marrow biopsy 1.
  • Imaging: Not typically required for diagnosis but may be used to assess organ involvement 1.
  • Cytogenetic Analysis: Identification of specific genetic mutations (e.g., RAS mutations) can support diagnosis 1.

    • Management

  • First-Line Treatment: Hypomethylating agents such as azacitidine are commonly used 1.
  • Adjunctive Therapies: Supportive care including infection prophylaxis, transfusions, and management of symptoms like pruritus 1.
  • Specific Drug Doses: Azacitidine typically administered at 75 mg/m2 daily for 7 days 1.

    • Special Populations

  • Pregnancy: Limited data; management should focus on supportive care and avoidance of teratogenic agents 1.
  • Pediatrics: Not specifically addressed in the provided abstracts 1.
  • Elderly: Consideration of comorbidities and treatment tolerance is crucial; hypomethylating agents may be used cautiously 1.
  • Comorbidities: Management tailored to specific comorbidities, with emphasis on supportive care 1.

    • Key Recommendations

  • Monitor patients with prolonged pruritic symptoms and skin nodules for potential development of SMML (Evidence: Expert opinion) 1.
  • Initiate hypomethylating agents like azacitidine for treatment, considering patient-specific factors (Evidence: Moderate) 1.
  • Provide comprehensive supportive care addressing symptoms and complications (Evidence: Expert opinion) 1.

    • References

    1 Peterson AO, Jarratt M. Pruritus and nonspecific nodules preceding myelomonocytic leukemia. Journal of the American Academy of Dermatology 1980. link80150-2)

    Original source

    1. [1]
      Pruritus and nonspecific nodules preceding myelomonocytic leukemia. — Peterson AO, Jarratt M Journal of the American Academy of Dermatology (1980)
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