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Gattazzo, Cristina; Teramo, Antonella; Passeri, Francesca; De March, Elena; Carraro, Samuela; Trimarco, Valentina; Frezzato, Federica; Berno, Tamara; Barilà, Gregorio; Martini, Veronica; Piazza, Francesco; Trentin, Livio; Facco, Monica; Semenzato, Gianpietro; Zambello, Renato
Haematologica (Roma) 99, Številka: 12Journal Article
The etiology of chronic large granular lymphocyte proliferations is largely unknown. Although these disorders are characterized by the expansion of different cell types (T and natural killer) with specific genetic features and abnormalities, several lines of evidence suggest a common pathogenetic mechanism. According to this interpretation, we speculated that in patients with natural killer-type chronic lymphoproliferative disorder, together with natural killer cells, also T lymphocytes undergo a persistent antigenic pressure, possibly resulting in an ultimate clonal T-cell selection. To strengthen this hypothesis, we evaluated whether clonal T-cell populations were detectable in 48 patients with killer immunoglobulin-like receptor-restricted natural killer-type chronic lymphoproliferative disorder. At diagnosis, in half of the patients studied, we found a clearly defined clonal T-cell population, despite the fact that all cases presented with a well-characterized natural killer disorder. Follow-up analysis confirmed that the TCR gamma rearrangements were stable over the time period evaluated; furthermore, in 7 patients we demonstrated the appearance of a clonal T subset that progressively matures, leading to a switch between killer immunoglobulin-like receptor-restricted natural killer-type disorder to a monoclonal T-cell large granular lymphocytic leukemia. Our results support the hypothesis that a common mechanism is involved in the pathogenesis of these disorders.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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