Clonal hematopoiesis in large granular lymphocytic leukemia

Area of Science:

• Hematology
• Oncology
• Genetics

Background:

• Large granular lymphocytic leukemia (LGLL) and T-cell clonopathy of unknown significance (TCUS) can coexist with myeloid neoplasms (MN).
• Clonal hematopoiesis (CH) may precede or coincide with these conditions, potentially influencing T-cell reactions.

Purpose of the Study:

• To determine the incidence of CH in LGLL/TCUS patients.
• To investigate the genetic landscape and clinical features of CH in LGLL.
• To assess the relationship between CH and the development of MN in LGLL patients.

Main Methods:

• Retrospective analysis of 349 LGLL/TCUS patients, 672 MN patients, and 1443 CH individuals.
• Identification of CH in LGLL/TCUS cohorts.
• Multivariate analysis to identify risk factors for cytopenia in LGLL.

Main Results:

• CH was identified in 19% of LGLL/TCUS patients (CH+/LGLL), with TET2 and DNMT3A as common mutations.
• The incidence of CH in LGLL was significantly higher than in age-matched controls.
• CH in LGLL was an independent risk factor for cytopenia and was associated with a higher progression rate to MN.

Conclusions:

• A significant association exists between CH and LGLL.
• Cytopenias in LGLL may be attributed to both LGLL and coexisting CH.
• CH in LGLL patients warrants close monitoring due to increased risk of MN progression.