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Published in: Breast Cancer Research 6/2005

Open Access 01-12-2005 | Research article

Prognostic relevance of disseminated tumor cells in the bone marrow and biological factors of 265 primary breast carcinomas

Authors: Christian Schindlbeck, Theresa Kampik, Wolfgang Janni, Brigitte Rack, Udo Jeschke, Stan Krajewski, Harald Sommer, Klaus Friese

Published in: Breast Cancer Research | Issue 6/2005

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Abstract

Introduction

The prognostic significance of disseminated tumor cells in the bone marrow (DTC-BM) of breast cancer patients has been demonstrated in many studies. Yet, it is not clear which of the primary tumors' biological factors predict hematogenous dissemination. We therefore examined 'tissue micro arrays' (TMAs) of 265 primary breast carcinomas from patients with known bone marrow (BM) status for HER2, Topoisomerase IIα (Top IIa), Ki 67, and p53.

Methods

BM analysis was performed by cytospin preparation and immunocytochemical staining for cytokeratin (CK). TMAs were examined by immunohistochemistry (IHC) for HER2, Top IIa, Ki 67 and p53, and fluorescence in situ hybridization (FISH) for HER2.

Results

HER2 (2+/3+) was positive in 35/167 (21%) cases (FISH 24.3%), Top IIa (>10%) in 87/187 (46%), Ki 67 in 52/184 (28%) and p53 (>5%) in 61/174 cases (34%). Of 265 patients, 68 (25.7%) showed DTC-BM with a median of 2/2 × 106 cells (1 to 1,500). None of the examined factors significantly predicted BM positivity. Significant correlation was seen between HER2 IHC and Top IIa (p = 0.06), Ki 67 (p = 0.031), and p53 (p < .001). Top IIa correlated with Ki 67 and p53, and Ki 67 also with p53 (p = 0.004). After a median follow-up of 60.5 months (7 to 255), the presence of DTC-BM showed prognostic relevance for overall survival (p = 0.03), whereas HER2 (IHC, p = 0.04; FISH, p = 0.03) and Ki 67 (p = 0.04) correlated with disease free survival, and HER2 with distant disease free survival (IHC, p = 0.06; FISH, p = 0.05).

Discussion

The congruence of the examined factors' expression rates indicates a causal line of suppressor, proliferation, and mitosis markers, and growth factor receptors. Hematogenous tumor cell spread seems to be an independent process. The examination of these factors on DTC-BM is the aim of ongoing research.
Appendix
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Metadata
Title
Prognostic relevance of disseminated tumor cells in the bone marrow and biological factors of 265 primary breast carcinomas
Authors
Christian Schindlbeck
Theresa Kampik
Wolfgang Janni
Brigitte Rack
Udo Jeschke
Stan Krajewski
Harald Sommer
Klaus Friese
Publication date
01-12-2005
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 6/2005
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr1360

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