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Overview
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Anaplastic lymphoma kinase (ALK) is a novel receptor protein-tyrosine kinase. ALK can create afusion protein with a nuclear protein gene called nucleophosmin (NPM) via the amino terminus ofNPM and the catalytic domain of ALK. The product of this fusion protein is oncogenic. Studies havefound this chromosomal translocation in most anaplastic large-cell non-Hodgkin's lymphomas, making ALK a good marker for anaplastic large cell lymphomas. ANXA1 is strongly expressed on thecell membrane and occasionally in the cytoplasm of tumour cells in 97% of samples from patientswith hairy cell leukaemia. By contrast, B-cell lymphomas other than hairy cell leukaemia, includingtypical splenic lymphoma with villous lymphocytes and patients with variant hairy cell leukaemiaîasdefined by current morphologic, phenotypic, and clinical criteriaîare ANXA1-negative.
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Overview