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All that glitters is not LGL Leukemia

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LEUKEMIA
卷 36, 期 11, 页码 2551-2557

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SPRINGERNATURE
DOI: 10.1038/s41375-022-01695-x

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  1. Associazione Italiana per la Ricerca sul Cancro (AIRC) [IG-20216]

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LGL disorders are rare hematological neoplasias with phenotypic, genotypic, and clinical heterogeneity. STAT signaling plays a crucial role in abnormal cell survival. STAT3 and STAT5b mutations are the most common genetic lesions in T-LGL leukemia and have important implications for diagnosis and classification.
LGL disorders are rare hematological neoplasias with remarkable phenotypic, genotypic and clinical heterogeneity. Despite these constraints, many achievements have been recently accomplished in understanding the aberrant pathways involved in the LGL leukemogenesis. In particular, compelling evidence implicates STAT signaling as a crucial player of the abnormal cell survival. As interest increases in mapping hematological malignancies by molecular genetics, the relevance of STAT gene mutations in LGL disorders has emerged thanks to their association with discrete clinical features. STAT3 and STAT5b mutations are recognized as the most common gain-of-function genetic lesions up to now identified in T-LGL leukemia (T-LGLL) and are actually regarded as the hallmark of this disorder, also contributing to further refine its subclassification. However, from a clinical perspective, the relationships between T-LGLL and other borderline and overlapping conditions, including reactive cell expansions, clonal hematopoiesis of indeterminate potential (CHIP) and unrelated clonopathies are not fully established, sometimes making the diagnosis of T cell malignancy challenging. In this review specifically focused on the topic of clonality of T-LGL disorders we will discuss the rationale of the appropriate steps to aid in distinguishing LGLL from its mimics, also attempting to provide new clues to stimulate further investigations designed to move this field forward.

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