Abstract
Large granular lymphocyte leukemia (LGL-L) is defined morphologically as a group of lymphoproliferative disorders, including T-cell large granular lymphocytic leukemia (T-LGL-L), chronic lymphoproliferative disorders of NK cells (CLPD-NK), and aggressive NK cell leukemia. We investigated the morphological features of LGL leukemic cells in LGL-L patients to identify screening methods best suited to application in daily clinical practice. LGL leukemic cells were mostly indistinguishable from normal LGL; however, we developed a simplified approach to distinguishing among these cells, in which lymphocyte % and the proportion of granular lymphocytes among lymphocytes (GL %) can serve as parameters at the cut-off values of 52 and 50 %, respectively. We confirmed the accuracy of these methods in validation groups. It may be useful to evaluate GL % to screen for LGL-L using a cut-off threshold of 50 when Lym % exceeds 52 in the peripheral blood examination in cases in which LGL-L is suspected in daily practice while keeping clinical context and the coefficient of variation of these parameters under consideration.
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Acknowledgments
We appreciate Ms. Haruka Nakamura and Ms. Nana Suzuki (School of Health Sciences, Shinshu University, Matsumoto, Japan) for their technical assistances. We are also grateful to Dr. Akio Saito (Fujioka General Hospital, Fujioka, Japan), Dr.Yasunobu Takeoka (Saiseikai Nakatsu Hospital, Osaka, Japan) and Dr. Shinya Sato (Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan) for providing clinical data.
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Tanahashi, T., Sekiguchi, N., Matsuda, K. et al. A screening method with lymphocyte percentage and proportion of granular lymphocytes in the peripheral blood for large granular lymphocyte (LGL) leukemia. Int J Hematol 105, 87–91 (2017). https://doi.org/10.1007/s12185-016-2092-1
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DOI: https://doi.org/10.1007/s12185-016-2092-1