Polo-like kinase isoforms in breast cancer : expression patterns and prognostic implications

Polo-like kinase (PLK) family members are known to be functionally involved in mitotic signaling and in cytoskeletal reorganization in both normal and malignant cells. In this study, expression of PLK1 and PLK3 was determined immunohistochemically in tissue specimens of 135 breast carcinomas, and ex...

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Veröffentlicht in:Virchows Archiv : an international journal of pathology 2005-04, Vol.446 (4), p.442-450
Hauptverfasser: WEICHERT, Wilko, KRISTIANSEN, Glen, WINZER, Klaus-Jürgen, SCHMIDT, Mathias, GEKELER, Volker, NOSKE, Aurelia, MÜLLER, Berit-Maria, NIESPOREK, Silvia, DIETEL, Manfred, DENKERT, Carsten
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container_title Virchows Archiv : an international journal of pathology
container_volume 446
creator WEICHERT, Wilko
KRISTIANSEN, Glen
WINZER, Klaus-Jürgen
SCHMIDT, Mathias
GEKELER, Volker
NOSKE, Aurelia
MÜLLER, Berit-Maria
NIESPOREK, Silvia
DIETEL, Manfred
DENKERT, Carsten
description Polo-like kinase (PLK) family members are known to be functionally involved in mitotic signaling and in cytoskeletal reorganization in both normal and malignant cells. In this study, expression of PLK1 and PLK3 was determined immunohistochemically in tissue specimens of 135 breast carcinomas, and expression was correlated with clinicopathological parameters and patient prognosis. Strong PLK isoform overexpression was observed in 42.2% (PLK1) and 47.4% (PLK3) of breast carcinomas when compared with non-transformed breast tissue. A positive correlation of PLK isoform expression with tumor grade, vascular invasion, erbB2/HER-2 expression and markers of proliferative activity was evident. Additionally, an inverse correlation of PLK isoform expression and estrogen receptor status was observed. Overexpression of PLK3 but not of PLK1 was significantly linked to reduced median overall (P
doi_str_mv 10.1007/s00428-005-1212-8
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In this study, expression of PLK1 and PLK3 was determined immunohistochemically in tissue specimens of 135 breast carcinomas, and expression was correlated with clinicopathological parameters and patient prognosis. Strong PLK isoform overexpression was observed in 42.2% (PLK1) and 47.4% (PLK3) of breast carcinomas when compared with non-transformed breast tissue. A positive correlation of PLK isoform expression with tumor grade, vascular invasion, erbB2/HER-2 expression and markers of proliferative activity was evident. Additionally, an inverse correlation of PLK isoform expression and estrogen receptor status was observed. Overexpression of PLK3 but not of PLK1 was significantly linked to reduced median overall (P&lt;0.001) and relapse-free (P=0.021) survival time. PLK3 expression remained an independent prognostic factor for overall (RR=3.2, P=0.002) and relapse-free (RR=2.9, P=0.049) survival in multivariate survival analysis. These results suggest PLK3 as a novel independent prognostic marker in breast cancer and hint toward a role for PLK isoform overexpression in disease progression. Therefore, in vivo inhibition of PLK family members might represent a rewarding approach in the development of new anticancer drugs for this tumor entity.</description><identifier>ISSN: 0945-6317</identifier><identifier>EISSN: 1432-2307</identifier><identifier>DOI: 10.1007/s00428-005-1212-8</identifier><identifier>PMID: 15785925</identifier><language>eng</language><publisher>Berlin: Springer</publisher><subject>Adult ; Aged ; Aged, 80 and over ; Biological and medical sciences ; Biomarkers, Tumor - metabolism ; Breast cancer ; Breast Neoplasms - enzymology ; Breast Neoplasms - mortality ; Breast Neoplasms - pathology ; Carcinoma, Ductal, Breast - enzymology ; Carcinoma, Ductal, Breast - mortality ; Carcinoma, Ductal, Breast - pathology ; Carcinoma, Lobular - enzymology ; Carcinoma, Lobular - mortality ; Carcinoma, Lobular - pathology ; Cell Cycle Proteins - metabolism ; Estrogens ; Female ; Gynecology. Andrology. 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In this study, expression of PLK1 and PLK3 was determined immunohistochemically in tissue specimens of 135 breast carcinomas, and expression was correlated with clinicopathological parameters and patient prognosis. Strong PLK isoform overexpression was observed in 42.2% (PLK1) and 47.4% (PLK3) of breast carcinomas when compared with non-transformed breast tissue. A positive correlation of PLK isoform expression with tumor grade, vascular invasion, erbB2/HER-2 expression and markers of proliferative activity was evident. Additionally, an inverse correlation of PLK isoform expression and estrogen receptor status was observed. Overexpression of PLK3 but not of PLK1 was significantly linked to reduced median overall (P&lt;0.001) and relapse-free (P=0.021) survival time. PLK3 expression remained an independent prognostic factor for overall (RR=3.2, P=0.002) and relapse-free (RR=2.9, P=0.049) survival in multivariate survival analysis. These results suggest PLK3 as a novel independent prognostic marker in breast cancer and hint toward a role for PLK isoform overexpression in disease progression. Therefore, in vivo inhibition of PLK family members might represent a rewarding approach in the development of new anticancer drugs for this tumor entity.</abstract><cop>Berlin</cop><pub>Springer</pub><pmid>15785925</pmid><doi>10.1007/s00428-005-1212-8</doi><tpages>9</tpages></addata></record>
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subjects Adult
Aged
Aged, 80 and over
Biological and medical sciences
Biomarkers, Tumor - metabolism
Breast cancer
Breast Neoplasms - enzymology
Breast Neoplasms - mortality
Breast Neoplasms - pathology
Carcinoma, Ductal, Breast - enzymology
Carcinoma, Ductal, Breast - mortality
Carcinoma, Ductal, Breast - pathology
Carcinoma, Lobular - enzymology
Carcinoma, Lobular - mortality
Carcinoma, Lobular - pathology
Cell Cycle Proteins - metabolism
Estrogens
Female
Gynecology. Andrology. Obstetrics
Humans
Immunohistochemistry
Investigative techniques, diagnostic techniques (general aspects)
Isoenzymes - metabolism
Mammary gland diseases
Medical sciences
Middle Aged
Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques
Polo-Like Kinase 1
Prognosis
Protein Kinases - metabolism
Protein Serine-Threonine Kinases - metabolism
Proto-Oncogene Proteins - metabolism
Survival Analysis
Survival Rate
Tumor Suppressor Proteins
Tumors
title Polo-like kinase isoforms in breast cancer : expression patterns and prognostic implications
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