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Detection of terminal deoxynucleotidyl transferase (TdT) by flow cytometry in leukemic disorders

RH Bardales, A Carrato, M Fleischer, MK Schwartz and B Koziner

Lymphocyte Surface Marker Laboratory, Memorial Sloan-Kettering Cancer Center, New York, New York 10021.

We applied a new technique to the detection of intracellular TdT in 26 leukemic patients, including 16 non-T acute lymphoblastic leukemia (ALL), four T-ALL, one T-lymphoblastic lymphoma in leukemia phase, one undifferentiated leukemia, one de novo lymphoblastic phase of chronic myeloid leukemia, and three acute monocytic leukemias (AMOL). Mononuclear cell suspensions were incubated in saponin to permeabilize the cell membrane. The cells were then stained by indirect immunofluorescence (IF) using anti-human TdT monoclonal antibodies and were analyzed by flow cytometry (FCM). The TdT results were compared with those obtained by biochemical TdT assay (26 cases), immunoperoxidase determination (PAP) (12 cases), and fluorescence microscopy (seven cases). The results obtained by PAP and fluorescence microscopy were 100% concordant with those obtained by FCM and biochemical assay. TdT determination by FCM allows the analysis of large numbers of cells in a fast, objective, and reliable manner, as compared with biochemical assay, PAP, and fluorescence microscopy determinations.

Volume 37, Issue 4, pp. 509-513, 04/01/1989
Copyright © 1989 by The Histochemical Society


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