Immunophenotyping of acute leukemia by flow cytometric analysis. Use of CD45 and right-angle light scatter to gate on leukemic blasts in three-color analysis.
Am J Clin Pathol
; 100(5): 534-40, 1993 Nov.
Article
in En
| MEDLINE
| ID: mdl-8249893
ABSTRACT
This article describes a procedure for performing routine three-color flow cytometric analysis for acute leukemia on lysed whole bone marrow preparations. This technique uses the combination of CD45 intensity and right-angle light scatter (RALS) to distinguish leukemic cells from normal lymphocytes, monocytes, neutrophils, eosinophils, and nucleated red blood cells. On this display, leukemic cells occupy a unique blast region characterized by intermediate CD45 density and low RALS, which, in normal marrows, contains less than 5% of the total cells. This approach was applied to 39 cases of acute leukemia and 8 cases of myelodysplasia or myeloproliferative disorders. The estimate of blasts by flow cytometric analysis was correlated highly with morphologic leukemic cell counts over a wide range. Moreover, the pattern seen on the CD45-RALS display was different for different French-American-British subtypes of leukemia, suggesting that this pattern might be useful for categorization. When CD45-peridin chlorophyll alpha protein was combined with other pairs of fluorescein isothiocyanate- and phycoerythrin-conjugated reagents, it was possible to set an analysis window on the leukemic blasts and display dual-parameter (ie, green vs. red fluorescence) data regarding expression of two additional markers on the leukemic population. This gating strategy was superior to traditional forward-angle versus RALS displays in that it did a better job of isolating the leukemic cells analytically.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Bone Marrow
/
Leukemia, Myeloid, Acute
/
Immunophenotyping
/
Precursor Cell Lymphoblastic Leukemia-Lymphoma
/
Flow Cytometry
Limits:
Humans
Language:
En
Journal:
Am J Clin Pathol
Year:
1993
Document type:
Article