Concurrent overexpression of p53 and c-erbB-2 correlates with accelerated cycling and concomitant poor prognosis in node-negative breast cancer

被引:34
作者
Rudolph, P
Alm, P
Olsson, H
Heidebrecht, HJ
Fernö, M
Baldetorp, B
Parwaresch, R
机构
[1] Univ Kiel, Dept Pathol, D-24105 Kiel, Germany
[2] Univ Kiel, Dept Hematopathol, D-24105 Kiel, Germany
[3] Univ Lund Hosp, Dept Pathol, S Swedish Breast Canc Grp, S-22185 Lund, Sweden
[4] Univ Lund Hosp, Dept Oncol, S Swedish Breast Canc Grp, S-22185 Lund, Sweden
关键词
p53; c-erbB-2; cell cycle; Ki-S2; breast cancer; prognosis;
D O I
10.1053/hupa.2001.22748
中图分类号
R36 [病理学];
学科分类号
100104 ;
摘要
Simultaneous overexpression of c-erbB-2 and p53 has been reported to be prognostically unfavorable in breast cancer. Herein, we show that concurrent overexpression of these 2 proteins is associated with a marked reduction in the relative fraction of cells in G(1) phase of the cell cycle, indicating an accelerated cell cycle progression. Using an immunohistochemical approach, we examined 261 cases of node-negative infiltrating ductal carcinomas of the breast with respect to c-erbB-2 and p53 expression and to the proliferative activity measured by the Ki-67 index. By means of a novel monoclonal antibody, Ki-S2, which exclusively recognizes proliferating cells in the S, G(2), and M phases of the reproductive cycle, we were further able to calculate the relative fraction of the cells having passed the restriction point at the G(1)/S boundary, thus defining a cycling ratio (CR). The results were correlated with clinical outcome; median follow-up time was 96 months. Tumors that simultaneously overexpressed c-erbB-2 and p53 had a high median CR and followed an unfavorable course. However, increased CRs were also observed independently of c-erbB-2 and p53 overexpression, suggesting that other molecular mechanisms may contribute to acceleration of cell cycle progression. In a multivariate analysis that included patient age, tumor size, hormone receptor status, c-erbB-2 and p53 expression, and the Ki-67 index, CR emerged as the most significant independent predictor of overall and disease-free survival (P < .0001). It is concluded that the CR is a gauge of cell cycle deregulation and therefore may be a powerful indicator of the biologic behavior of cancers. HUM PATHOL 32:311-319. Copyright (C) 2001 by W.B. Saunders Company.
引用
收藏
页码:311 / 319
页数:9
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