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TIA-1 expression in hairy cell leukemia.
Naoyoshi Mori1, Yoshiko Idate Murakami, Satoko Shimada
1Department of Pathology of Biological Response, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Japan. naoyoshi@med.nagoya-u.ac.jp
Summary
T-cell intracellular antigen-1 (TIA-1) expression is a potential diagnostic marker for hairy cell leukemia. Unlike other B-cell lymphomas, hairy cell leukemia cells show TIA-1 expression, aiding in differential diagnosis.
Area of Science:
- Hematology
- Immunohistochemistry
- Oncology
Background:
- Hairy cell leukemia (HCL) is a rare B-cell malignancy.
- Accurate diagnosis of HCL is crucial for appropriate treatment.
- Distinguishing HCL from other B-cell lymphomas can be challenging.
Purpose of the Study:
- To investigate the diagnostic utility of T-cell intracellular antigen-1 (TIA-1) expression in hairy cell leukemia.
- To compare TIA-1 expression patterns in HCL with various B-cell lymphomas.
Main Methods:
- Immunohistochemical analysis of TIA-1 expression in neoplastic cells of HCL cases.
- Evaluation of TIA-1 expression in a large cohort of diverse B-cell lymphomas.
- Correlating TIA-1 positivity with other established HCL markers.
Main Results:
- Cytoplasmic TIA-1 expression was observed in 5 out of 9 HCL cases, characterized by a distinct dot-like, granular pattern.
- Neoplastic cells in HCL were negative for granzyme B and perforin.
- All 94 evaluated B-cell lymphomas, including various subtypes, were negative for TIA-1 expression.
Conclusions:
- TIA-1 expression in neoplastic cells is a potential diagnostic marker for hairy cell leukemia.
- The absence of TIA-1 expression in other B-cell lymphomas supports its utility in differentiating HCL.
- TIA-1 reactivity in neoplastic cells does not exclusively indicate T-cell or NK-cell origin.