Heat shock protein90 in lobular neoplasia of the breastReport as inadecuate




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BMC Cancer

, 8:312

First Online: 28 October 2008Received: 03 March 2008Accepted: 28 October 2008DOI: 10.1186-1471-2407-8-312

Cite this article as: Zagouri, F., Nonni, A., Sergentanis, T.N. et al. BMC Cancer 2008 8: 312. doi:10.1186-1471-2407-8-312

Abstract

BackgroundHeat shock protein 90 Hsp90 overexpression has been implicated in breast carcinogenesis, with putative prognostic and therapeutic implications. The purpose of this study is to evaluate the immunohistochemical expression of Hsp90 and to examine whether Hsp90 expression is associated with estrogen receptor alpha ER-alpha and beta ER-beta immunostaining in lobular neoplasia LN of the breast.

MethodsTissue specimens were taken from 44 patients with LN. Immunohistochemical assessment of Hsp90, ER-alpha and ER-beta was performed both in the lesion and the adjacent normal breast ducts and lobules; the latter serving as control. As far as Hsp90 evaluation is concerned: i the percentage of positive cells, and ii the intensity was separately analyzed. Additionally, the Allred score was adopted and calculated. Accordingly, Allred score was separately evaluated for ER-alpha and ER-beta. The intensity was treated as an ordinal variable-score 0: negative, low: 1, moderate: 2, high: 3. Statistical analysis followed.

ResultsHsp90 immunoreactivity was mainly cytoplasmic in both the epithelial cells of normal breast ducts and lobules and LN. Some epithelial cells of LN also showed nuclear staining, but all the LN foci mainly disclosed a positive cytoplasmic immunoreaction for Hsp90. In addition, rare intralobular inflammatory cells showed a slight immunoreaction. The percentage of Hsp90 positive cells in the LN areas was equal to 67.1 ± 12.2%, whereas the respective percentage in the normal adjacent breast tissue was 69.1 ± 11.6%; the difference was not statistically significant. The intensity score of Hsp90 staining was 1.82 ± 0.72 in LN foci, while in the normal adjacent tissue the intensity score was 2.14 ± 0.64. This difference was statistically significant p = 0.029, Wilcoxon matched-pairs signed-ranks test. The Hsp90 Allred score was 6.46 ± 1.14 in the LN foci, significantly lower than in the normal adjacent tissue 6.91 ± 0.92, p = 0.049, Wilcoxon matched-pairs signed-ranks test. Within the LN foci, the Hsp90 Allred score was neither associated with ER-alpha, nor with ER-beta percentage.

ConclusionHsp90 was lower in LN foci both at the level of intensity and Allred score, a finding contrary to what might have been expected, given that high Hsp90 expression is detected in invasive breast carcinomas. Hsp90 deregulation does not seem to be a major event in LN pathogenesis.

AbbreviationsHspHeat shock protein

ER-alphaestrogen receptors alpha

ER-betaestrogen receptors beta

LNlobular neoplasia

ALHatypical lobular hyperplasia

LCISlobular carcinoma in situ.

Electronic supplementary materialThe online version of this article doi:10.1186-1471-2407-8-312 contains supplementary material, which is available to authorized users.

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Author: Flora Zagouri - Afrodite Nonni - Theodoros N Sergentanis - Christos A Papadimitriou - Nikolaos V Michalopoulos - Andreas 

Source: https://link.springer.com/







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