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Pediatric_Oncology_A_Comprehensive_Guide.pdf
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P. Imbach

 

 

2.4.3Immunological Characterization

Monoclonal antibodies to leukemia-associated antigens differentiate between types of leukemic cells

Subtypes of clonal cell (CD) populations with malignant transformation in different maturational stages can be identified by fluorescence-activated cell-sorting (FACS) analysis

Immunological characteristics

 

 

Lymphoid stem cellsa

Precursor-B cells

Pre-B cells

CD19

CD19, CD22

CD19, CD22

HLA-DR

HLA-DR

HLA-DR

CD24±

CD24+/−

CD24

 

CD 10+/−

CD10

 

CD79a

CD20±

 

 

CD 79a

aAlso called “pro-B ALL”

Precursor T-cells

 

 

 

Lymphoid stem cellsa

Early precursor-T cells

Precursor-T cells

Mature T cells

 

CD3

CD3

CD3

CD7

CD7

CD7

CD7

 

CD5

CD5

CD5

 

CD2±

CD2

CD2

 

 

CD1

CD3

 

 

CD4±

CD4 or CD8

 

 

CD8±

 

aAlso called “pro-T ALL”

 

 

Clinical importance of immunological characterization:

Eighty-five percent of children with common ALL (usually precursor-B-cell ALL) are HLA-DR- and CD10-positive, which indicates a good prognosis

Children with T-cell ALL are characterized by: older age (peak at 8 years of age), with a ratio of males to females of 4:1; high initial leukocyte count, mediastinal enlargement, high proliferation rate or frequent extramedullary manifestation (initially and at relapse)

In ALL relapse, the immunological phenotype is usually the same as at initial

diagnosis

2.4.4Biochemical Characterization

Some cellular enzymes provide further diagnostic differentiation between ALL and AML.

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