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CASE REPORTS
COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Activated killer cell lymphoma: an erythrophagocytic syndrome simulating histiocytic medullary histiocytosis.
Pathology 1988 July
We report a detailed analysis of a lymphoma-induced erythrophagocytic syndrome mimicking histiocytic medullary reticulosis. Phenotypic analysis of cell surface molecules demonstrated a T cell-like phenotype. However, more extensive analysis showed that this phenotype was not typical of any element of the normal T cell lineage. The markers were consistent with a subset of natural killer cells, the lymphokine-activated killer (LAK) cell. The lymphoma cells, like normal LAK cells, were shown to be capable of non-specific cytotoxicity. Moreover, consistent with the reported regulatory effects of certain non-specific killer cells on hemopoiesis, the lymphoma cells were able to suppress in-vitro hemopoiesis, especially maturation of erythroid precursors, although a soluble factor could not be directly demonstrated. Both of these activities were blocked by a monoclonal antibody (9.IC3) which inhibits NK cell function. These findings imply that this tumour is a neoplastic counterpart of the cell identifiable in vitro as an LAK cell.
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