Abstract |
A high percentage of extracutaneous CD30+ anaplastic large cell lymphomas (nodal ALCL) carry a specific chromosomal translocation, t(2;5) ( p23;q35), that results in abnormal expression of p80 NPM/ALK chimeric protein (p80). The protein p80 may be detected by immunohistochemistry using polyclonal (anti-p80) or monoclonal (ALK1) antibody directed against the ALK epitope. Although nodal ALCL, primary cutaneous ALCL, and lymphomatoid papulosis type A (lyp A) have similar histologic and immunohistochemical features, the expression of p80 in these cutaneous lesions has not been extensively studied. We immunostained tissues from 10 nodal ALCL, 8 primary cutaneous ALCL, 24 lyp A, and positive and negative controls using polyclonal rabbit anti-p80 and the avidin- biotin- peroxidase labeling method. Reactivity was determined by comparing staining intensity to positive controls [4 nodal ALCL with t(2;5)] and negative controls (21 non-ALCL lymphomas). Only cutaneous lesions staining positively with anti-p80 were further studied with the monoclonal antibody ALK1 and reverse transcription polymerase chain reaction (RT-PCR) for p80 messenger RNA. All positive controls (4/4), but none of the negative controls (0/21) nor lyp A (0/24), were immunoreactive for anti-p80. Sixty percent (6/10) of nodal ALCL and a single case (12%) of primary cutaneous ALCL were immunoreactive for anti-p80. In this exceptional cutaneous lesion, although we did not find NPM/ALK by RT-PCR, we detected strong expression of ALK using ALK1. We conclude that t(2;5) is rarely involved in the pathogenesis of cutaneous CD30+ lymphoproliferative disorders.
|
Authors | L D Su, B Schnitzer, C W Ross, M Vasef, S Mori, M Shiota, D Y Mason, K Pulford, J T Headington, T P Singleton |
Journal | Journal of cutaneous pathology
(J Cutan Pathol)
Vol. 24
Issue 10
Pg. 597-603
(Nov 1997)
ISSN: 0303-6987 [Print] United States |
PMID | 9449486
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
|
Chemical References |
- Ki-1 Antigen
- ALK protein, human
- Anaplastic Lymphoma Kinase
- Protein-Tyrosine Kinases
- Receptor Protein-Tyrosine Kinases
|
Topics |
- Anaplastic Lymphoma Kinase
- Chromosomes, Human, Pair 2
- Chromosomes, Human, Pair 5
- Humans
- Immunohistochemistry
- Ki-1 Antigen
(analysis)
- Lymphoproliferative Disorders
(genetics, metabolism, pathology)
- Polymerase Chain Reaction
- Protein-Tyrosine Kinases
(genetics, metabolism)
- Receptor Protein-Tyrosine Kinases
- Transcription, Genetic
- Translocation, Genetic
|