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Chloroacetate esterase positivity in acute lymphoblastic leukemia
American Journal of Clinical Pathology
|May 1, 1985
Summary
Chloroacetate esterase (CAE) reactivity, typically seen in acute nonlymphocytic leukemia (ANLL), was identified in a rare case of acute lymphoblastic leukemia (ALL). This finding suggests CAE is not exclusively specific to ANLL.
Area of Science:
- Hematology
- Oncology
- Cytochemistry
Background:
- Chloroacetate esterase (CAE) reactivity is a recognized marker for acute nonlymphocytic leukemia (ANLL).
- Its presence in acute lymphoblastic leukemia (ALL) has not been previously documented.
- Accurate differential diagnosis between ALL and ANLL is critical for appropriate treatment selection.
Observation:
- A single case of ALL exhibiting punctate CAE reactivity was identified among 400 newly diagnosed ALL patients.
- The patient's leukemic blasts met FAB L1 morphology criteria and were positive for terminal deoxynucleotidyl transferase (TdT).
- Myeloperoxidase and anti-myeloid monoclonal antibody panels were negative, confirming the ALL diagnosis.
Findings:
- This case demonstrates that CAE reactivity can rarely occur in ALL.
- The observed CAE positivity in an ALL case challenges its exclusive association with ANLL.
- Standard ALL therapy successfully induced remission in this patient.
Implications:
- CAE positivity alone is insufficient for diagnosing ANLL.
- Diagnostic conclusions for ANLL should integrate morphologic, cytochemical, immunocytologic, and clinical data.
- Further research may elucidate the mechanisms behind CAE expression in ALL.