Document Detail

Leukemia-associated changes identified by quantitative flow cytometry. IV. CD34 overexpression in acute myelogenous leukemia M2 with t(8;21).
MedLine Citation:
PMID:  8562943     Owner:  NLM     Status:  MEDLINE    
During the immunodiagnosis of 517 cases of acute myelogenous leukemia (AML) entered into the Medical Research Council (MRC) AML 10 trials, we have observed the CD34 precursor cell antigen more frequently in AML of M2 morphology, especially in the 84% of cases with the t(8;21) chromosomal translocation, than in any other French-American-British classification group. CD34 expression was then quantified (using QIFI and Quantum Simply Cellular beads [Flow Cytometry Standards, Research Triangle Park, NC] and CD34+ standard cells). When CD34 antibody-binding capacity (ABC) of normal bone marrow (BM) precursors and leukemic blasts was compared, it was shown that AML M2 cases with t(8;21) not only had the highest percentages of CD34+ blasts, but in > 80% of CD34+ cases the individual blasts expressed higher than normal levels of CD34 antigen (> 60 x 10(3) ABC per cell). In addition, in 73% of this group CD34 antigen was overexpressed in an asynchronous combination with cytoplasmic myeloperoxidase (MPO). Other signs of asynchrony included high CD34 expression with CD15 and/or CD56, as well as aberrant combinations of CD13 with terminal deoxynucleotidyl transferase (TdT) and CD19. These findings demonstrate that asynchrony is identifiable in virtually every case of AML with t(8;21), although it does not always involve the same antigens. M2 cases with t(8;21), mostly CD34+, had a 100% remission rate and 71% 5-year survival rate; other patients with CD34+ or CD34- AML showed 69% and 84% remission rates and 31% and 36% 5-year survival rates, respectively. Consequently, individual markers such as CD34 should be interpreted in relation to other features such as chromosomal changes. These simple methods, which are well suited to quantify the expression of ligands, are a useful contribution to diagnosis: 60% to 65% of M2 cases with t(8;21) are rapidly identified by CD34 overexpression alone. This aberration, together with the other signs of asynchrony seen at presentation, can be used to search for residual leukemia after therapy.
A Porwit-MacDonald; G Janossy; K Ivory; D Swirsky; R Peters; K Wheatley; H Walker; A Turker; A H Goldstone; A Burnett
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Blood     Volume:  87     ISSN:  0006-4971     ISO Abbreviation:  Blood     Publication Date:  1996 Feb 
Date Detail:
Created Date:  1996-03-01     Completed Date:  1996-03-01     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7603509     Medline TA:  Blood     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1162-9     Citation Subset:  AIM; IM    
Department of Clinical Immunology, Royal Free Hospital School of Medicine, London, UK.
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MeSH Terms
Antigens, CD34 / biosynthesis*,  genetics
Antigens, Neoplasm / biosynthesis*,  genetics
Chromosomes, Human, Pair 21 / ultrastructure*
Chromosomes, Human, Pair 8 / ultrastructure*
Cohort Studies
Flow Cytometry*
Gene Expression Regulation, Leukemic*
Leukemia, Myeloid, Acute / genetics*,  immunology,  mortality
Life Tables
Middle Aged
Oncogene Proteins, Fusion / genetics*
Survival Analysis
Translocation, Genetic*
Treatment Outcome
Tumor Markers, Biological / analysis*,  genetics
Reg. No./Substance:
0/Antigens, CD34; 0/Antigens, Neoplasm; 0/Oncogene Proteins, Fusion; 0/Tumor Markers, Biological

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