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Human Myxovirus Resistance Protein 1 (MxA) as a useful marker in the differential diagnosis of subcutaneous lymphoma vs. lupus erythematosus profundus.
MedLine Citation:
PMID:  23026440     Owner:  NLM     Status:  Publisher    
Background: Substantial clinicohistologic overlap exists between lupus erythematosus profundus (LEP) and lymphomas involving the subcutis, including subcutaneous panniculitis-like T-cell lymphoma (SPTCL) and primary cutaneous gamma/delta T-cell lymphoma (GDTCL). Unequivocal markers separating the entities are not established. Objectives: To explore the usefulness of interferon alpha (INF-α)-induced protein, myxovirus resistance protein 1 (MxA), in the differential diagnosis of these entities, as studies show that the expression pattern of MxA follows the distribution of the inflammatory infiltrate in cutaneous lupus, while INF- α is not known to operate in lymphoma.Materials and Methods: MxA immunohistochemistry was performed on skin biopsies from 5 patients with a clinical and histological diagnosis of SPTCL, 9 patients with GDTCL and 9 patients with LEP. Results: In SPTCL and GDTCL, MxA was primarily seen in macrophages and generally did not exceed 20% of the infiltrate. In contrast, a significant portion of the subcutaneous infiltrate was positive for MxA in LEP, with 50% of the infiltrate staining on average. A greater number of macrophages and lymphocytes stained with a greater intensity as well (P<0.001). Moreover, endothelial cell staining was uniquely identified in LEP but not in lymphoma.Conclusion: Although specificity is not 100%, minimal staining of MxA is a predictor for SPTCL or GDTCL. Conversely, extensive staining for MxA both qualitatively and quantitatively is a feature of LEP. Endothelial staining also appears to be specific for LEP.
Xuan Wang; Cynthia M Magro
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-2
Journal Detail:
Title:  European journal of dermatology : EJD     Volume:  -     ISSN:  1952-4013     ISO Abbreviation:  Eur J Dermatol     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9206420     Medline TA:  Eur J Dermatol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Pathology and Laboratory Medicine, Room F-309, 1300 York Avenue, Weill Medical College of Cornell University, New York 10065, United States of America.
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