scholarly journals Immunostaining patterns of myoepithelial cells in breast lesions: a comparison of CD10 and smooth muscle myosin heavy chain

2004 ◽  
Vol 57 (6) ◽  
pp. 625-629 ◽  
Author(s):  
A N Kalof
Keyword(s):  
Smooth Muscle ◽  
Myosin Heavy Chain ◽  
Heavy Chain ◽  
Myoepithelial Cells ◽  
Smooth Muscle Myosin ◽  
Breast Lesions ◽  
Muscle Myosin

Expression of Desmin and Smooth Muscle Myosin Heavy Chain in Dermatofibromas

2002 ◽  
Vol 126 (10) ◽  
pp. 1179-1183 ◽  
Author(s):  
Andrea K. Bruecks ◽  
Martin J. Trotter
Keyword(s):  
Smooth Muscle ◽  
Myosin Heavy Chain ◽  
Heavy Chain ◽  
Smooth Muscle Actin ◽  
Smooth Muscle Myosin ◽  
Immunoperoxidase Staining ◽  
Muscle Actin ◽  
Muscle Myosin ◽  
Hematoxylin Eosin ◽  
Focal Expression

Abstract Background.—The histopathologic features of dermatofibroma vary remarkably, and this diversity may occasionally cause problems in differentiating between benign and malignant mesenchymal lesions, including smooth muscle neoplasms. Immunohistochemical stains are sometimes necessary to clarify the histogenesis of a lesion. Objective.—To evaluate dermatofibromas for expression of desmin and smooth muscle myosin heavy chain (SM-MHC) antigens, which are commonly used as evidence of smooth muscle differentiation. Methods.—We studied 100 consecutive cases of dermatofibroma using hematoxylin-eosin–stained sections and immunoperoxidase staining with antibodies against desmin, SM-MHC, and smooth muscle actin. Results.—We found focal positivity for desmin in 9 cases, and in 2 of these cases, at least 10% of lesional cells showed strong expression. We found focal staining for SM-MHC in 10 cases, and in 2 of these cases, at least 10% of the lesional cells were positive. Regions positive for desmin and/or SM-MHC did not show definite histologic features of myogenous differentiation on hematoxylin-eosin–stained sections. All dermatofibromas expressing desmin and SM-MHC were also strongly positive for smooth muscle actin. Conclusions.—About 10% of dermatofibromas show focal expression of desmin and SM-MHC, and this expression may be present in up to 10% to 15% of lesional cells. Thus, in dermal spindle cell lesions, focal expression of these muscle antigens, like that of smooth muscle actin, is not diagnostic of a smooth muscle tumor.

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