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      Expression of tissue inhibitor of matrix metalloproteinases (TIMP)-3 protein in invasive breast carcinoma: Relation to tumor phenotype and clinical outcome

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          Abstract

          Introduction

          Our aim was to study the expression pattern of tissue inhibitor of metalloproteinases (TIMP)-3 protein in invasive breast carcinoma, and its clinicopathological and prognostic value as well as its relation to markers indicative of the tumor phenotype.

          Methods

          Immunohistochemistry was performed on paraffin-embedded tissue specimens from 173 invasive breast carcinomas to detect the proteins TIMP-3, estrogen receptor (ER), progesterone receptor, p53, c-erbB-2, topoisomerase IIα and Bcl-2.

          Results

          TIMP-3 protein was immunodetected in the cytoplasm of the malignant cells and the peritumoral stroma, as well as in in situ carcinoma and normal epithelium. Reduced expression of TIMP-3 protein within cancer cells was correlated with carcinomas of high nuclear and histological grade ( p = 0.032 and p = 0.015, respectively), and low ER expression ( p = 0.053). Moreover, TIMP-3 immunopositivity was inversely correlated with the expression of p53 and topoIIα proteins ( p = 0.002 and p = 0.008, respectively), whereas it was positively associated with Bcl-2 expression ( p = 0.020). Reduced expression of TIMP-3 protein within cancer cells was found to have an unfavorable impact on disease-free survival ( p = 0.052) in the entirety of the patient population, as well as in both subgroups of lymph-node-positive and mutant-p53-negative patients ( p = 0.007 and p = 0.037, respectively). Stromal localization of TIMP-3 protein was found to have no clinicopathological or prognostic value.

          Conclusion

          This is the first immunohistochemical study to show that TIMP-3 protein within cancer cells is associated with tumor phenotype. Reduced expression of TIMP-3 protein within cancer cells was found to correlate with an aggressive tumor phenotype, negatively affecting the disease-free survival of both subgroups of lymph node-positive and mutant-p53-negative patients.

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          Most cited references 39

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          Surfing the p53 network.

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            Histological grading of breast carcinomas: a study of interobserver agreement.

            Interobserver variation in the histological grading of breast carcinoma was investigated using the hypothesis that optimal fixation, more precise grading guidelines, some experience, the use of training and test sets, and a comparison of results with an expert group might allow higher levels of agreement. For the training sets sections from 50 consecutive cases of breast carcinoma received at the Sir Charles Gairdner Hospital (SCGH) and fixed in both B5 and buffered formal saline (BFS) were graded by consensus of three pathologists at the SCGH and independently by consensus of two pathologists at the Nottingham City Hospital (NCH) using a modified Scarff-Bloom-Richardson histological grading system with guidelines as suggested by NCH pathologists. The section quality and degree of preservation of nuclear morphology were judged by NCH pathologists to be superior for B5-fixed material. Complete agreement in grade between SCGH and NCH results was achieved for 83.3% of B5-fixed cases and 73.5% of BFS-fixed cases (P = .05) with relative disagreement rates (RDRs) of 0.15 and 0.29 and kappa statistic values of 0.73 and 0.58, respectively. Approximately 80% complete agreement was achieved for tubule formation, nuclear score, and mitotic count, with RDRs ranging from 0.19 to 0.27 and kappa values from 0.46 to 0.69. There was a consistent bias in the SCGH results toward a higher tubule score in both B5- and BFS-fixed material because of a difference in interpretation of cribriform or complex gland patterns and a consistent bias in SCGH results toward a lower nuclear size/pleomorphism score for B5 and BFS material. For the test set sections from 50 further consecutive cases of breast cancer fixed in B5 were examined using similar criteria but taking into account the sources of error shown by the training set. Approximately 80% complete agreement was again achieved for grade components and grade (RDRs, 0.18 and 0.72). Systematic bias was reduced in the test set, but no other improvement was observed. Of the tumors designated as grade I by NCH, 87.5% were called grade I tumors by SCGH in the B5 training set, 84.6% in the B5 test set, and 66.6% in the BFS training set. The levels of agreement shown in both the training and test sets were satisfactory and represented a significant improvement over our previous study, suggesting that experience and precise grading guidelines are of value. The similar levels of agreement in training and test sets suggest that reasonable results can be achieved without direct training by expert groups.(ABSTRACT TRUNCATED AT 400 WORDS)
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              Life-or-death decisions by the Bcl-2 protein family.

               Jenny Cory,  J. Adams (2000)
              In response to intracellular damage and certain physiological cues, cells enter the suicide program termed apoptosis, executed by proteases called caspases. Commitment to apoptosis is typically governed by opposing factions of the Bcl-2 family of cytoplasmic proteins. Initiation of the proteolytic cascade requires assembly of certain caspase precursors on a scaffold protein, and the Bcl-2 family determines whether this complex can form. Its pro-survival members can act by sequestering the scaffold protein and/or by preventing the release of apoptogenic molecules from organelles such as mitochondria. Pro-apoptotic family members act as sentinels for cellular damage: cytotoxic signals induce their translocation to the organelles where they bind to their pro-survival relatives, promote organelle damage and trigger apoptosis.
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                Author and article information

                Journal
                Breast Cancer Res
                Breast Cancer Research
                BioMed Central (London )
                1465-5411
                1465-542X
                2006
                10 October 2006
                : 8
                : 5
                : R57
                Affiliations
                [1 ]Department of Pathology, School of Medicine, National and Kapodistrian University of Athens, 75 Mikras Asias Street, Goudi, GR-115 27 Athens, Greece
                [2 ]Department of Pathology, Attikon Hospital, 1 Rimini Street, GR-124 62 Chaidari, Athens, Greece
                [3 ]Department of Pathology, Alexandra Hospital, 80 Vasilissis Sofias Street, GR-115 28 Athens, Greece
                bcr1607
                10.1186/bcr1607
                1779495
                17032447
                Copyright © 2006 Mylona et al.; licensee BioMed Central Ltd.

                This is an open access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                Categories
                Research Article

                Oncology & Radiotherapy

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