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ATRA Induced Reactive Hemophagocytosis: a Case Report
Monica Sharma1, Jasmita Dass, Seema Tyagi
1Department of Hematology, All India Institute of Medical Sciences, New Delhi.
Mediterranean Journal of Hematology and Infectious Diseases
|November 16, 2011
Summary
All trans-retinoic acid (ATRA) therapy for Acute Promyelcytic Leukemia (APL) can cause differentiated cells to be phagocytosed by marrow histiocytes. This occurs even without overt hemophagocytic syndrome, highlighting a unique cellular clearance mechanism.
Area of Science:
- Hematology
- Oncology
- Cell Biology
Background:
- All trans-retinoic acid (ATRA) is a standard targeted therapy for Acute Promyelcytic Leukemia (APL).
- ATRA induces differentiation of leukemic promyelocytes into mature leukocytes.
- The in vivo clearance mechanisms of ATRA-induced differentiated cells are not fully understood.
Observation:
- ATRA therapy is associated with hemophagocytosis.
- Phagocytosis of differentiated cells by histiocytes can occur without overt hemophagocytic syndrome.
- A case of APL under ATRA treatment showed marrow histiocytes phagocytosing differentiated cells.
Findings:
- Histiocytic phagocytosis of ATRA-induced differentiated cells in the bone marrow was observed.
- This phagocytosis occurred in the absence of clinically apparent hemophagocytic syndrome.
- The study documents a specific instance of cellular clearance during APL treatment.
Implications:
- This observation suggests a potential mechanism for the clearance of differentiated cells post-ATRA therapy.
- Understanding this process may refine monitoring strategies for APL patients on ATRA.
- Further research is warranted to elucidate the precise pathways and clinical significance of this histiocytic activity.
