How to establish the diagnosis of LGL leukemia.

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How to establish the diagnosis of LGL leukemia. How to establish the diagnosis of LGL leukemia. The diagnosis of LGL leukemia is made on the following criteria: common criteria of LGL leukemia. The diagnosis is based on a LGL peripheral expansion (> 0.5 × 109/L). Specific criteria for T-LGL leukemia include: expression of LGL surface markers compatible with an activated T-cell (commonly CD3+/CD8+/CD57+ and/or CD16+) phenotype; and clonal rearrangement of TCR-γ gene using PCR or specific and clonal Vβ expression using FCM. Specific criteria for NK-LGL leukemia and NK-LGL lymphocytosis include: expression of LGL surface markers compatible with an NK cell (commonly CD3−/CD8+/CD16+ and/or CD16+/CD56+) phenotype. The term chronic NK-LGL lymphocytosis is used for patients with relatively few symptoms and chronic illness, whereas patients with massive tissue LGL infiltration of the spleen, liver, and bone marrow and presenting aggressive clinical behavior are considered as having NK-LGL leukemia. Thierry Lamy, and Thomas P. Loughran Jr Blood 2011;117:2764-2774 ©2011 by American Society of Hematology