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Clinical Investigations |
Frauenklinik & Poliklinik, Klinikum rechts der Isar, Technische Universität, D-81675 München [S. B.]; II. Medizinische Klinik, Zentralklinikum, D-86165 Augsburg [G. Schl.]; I. Frauenklinik, Klinikum Innenstadt, Ludwig-Maximilians-Universität, D-80337 München [I. H.]; Frauenklinik, Universitätsklinikum Benjamin-Franklin, Freie Universität, D-12200 Berlin [G. Scha.]; Abt. für Gynäkopathologie [L. R.] and Molekulare Onkologie [K. P.], Frauenklinik, Universitätsklinikum Eppendorf, D-20246 Hamburg; and Institut für Immunologie, Ludwig-Maximilians-Universität, D-80336 München [G. R.]; Germany
Occult hematogenous micrometastases are the major cause for metastatic relapse and cancer-related death in patients with operable primary breast cancer. Although sensitive immunocytochemical and molecular methods allow detection of individual breast cancer cells in bone marrow (BM), a major site of metastatic relapse, current detection techniques cannot discriminate between nonviable shed tumor cells and seminal metastatic cells. To address this problem, we analyzed the relevance of erbB2 overexpression on disseminated cytokeratin-18-positive breast cancer cells in the BM of 52 patients with locoregionally restricted primary breast cancer using immunocytochemical double labeling with monoclonal antibody 9G6 to the p185erbB2 oncoprotein. Expression of p185erbB2 on BM micrometastases was detected in 31 of 52 (60%) patients independent of established risk factors such as lymph node involvement, primary tumor size, differentiation grade, or expression of p185erbB2 on primary tumor cells. After a median follow-up of 64 months, patients with p185erbB2-positive BM micrometastases had developed fatal metastatic relapses more frequently than patients with p185erbB2-negative micrometastases (21 versus 7 events; P = 0.032). In multivariate analysis, the presence of p185erbB2-positive micrometastases was an independent prognostic factor with a hazard ratio of 2.78 (95% confidence interval, 1.11–6.96) for overall survival (P = 0.029). We therefore conclude that erbB2 overexpression characterizes a clinically relevant subset of breast cancer micrometastases.
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