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Stromal remodeling and SPARC (secreted protein acid rich in cysteine) expression in invasive ductal carcinomas of the breast

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Abstract

In the present study, we analyzed tumor associated stromal remodeling with special respect to SPARC (secreted protein acid rich in cysteine) expression. 25 invasive ductal carcinomas of the breast and corresponding tumor-free breast tissue were studied immunohistochemically (CD34, α-SMA, SPARC and TGFβ-R1). Tumor associated stroma was characterized by a loss of CD34 expression, paralleled by a gain in α-SMA. While SPARC expression was virtually absent from normal stromal cells in the tumor stroma, strong cytoplasmic SPARC reactivity was found in the majority of stromal cells. The TGFβ-R1 also showed stronger expression in the tumor stroma compared to that of the normal breast. Stromal response to antecedent core needle biopsy was similar to that observed in the tumor stroma. We conclude that SPARC overexpression is a constant and functionally important feature of invasive ductal carcinomas, since SPARC mediates stromal de-adhesion crucial for local tumor invasion and systemic spread, respectively. When considering changes of the stromal phenotype (normal: CD34+α-SMA−SPARC− vs. carcinoma: CD34−α-SMA+SPARC+) as a tool in distinguishing benign from malignant breast lesion one has to keep in mind that the phenotype of granulation tissue in areas of antecedent biopsy resembles that of tumor stroma.

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Authors and Affiliations

  1. Institute of Pathology, Philipps-University Marburg, Baldingerstraße, 35033, Marburg, Germany

    Peter J. Barth, Roland Moll & Annette Ramaswamy

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  1. Peter J. Barth
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  2. Roland Moll
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  3. Annette Ramaswamy
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Correspondence to Peter J. Barth.

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Barth, P.J., Moll, R. & Ramaswamy, A. Stromal remodeling and SPARC (secreted protein acid rich in cysteine) expression in invasive ductal carcinomas of the breast. Virchows Arch 446, 532–536 (2005). https://doi.org/10.1007/s00428-005-1256-9

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  • DOI: https://doi.org/10.1007/s00428-005-1256-9

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