Köstler WJ, Brodowicz T, Hudelist G, Rudas M, Horvat R, Steger GG, Singer CF, Attems J, Rabitsch W, Fakhrai N, Elandt K, Wiltschke C, Hejna M, Zielinski CC. The efficacy of trastuzumab in Her-2/neu-overexpressing metastatic breast cancer is independent of p53 status.
J Cancer Res Clin Oncol 2005;
131:420-8. [PMID:
15864644 DOI:
10.1007/s00432-005-0670-3]
[Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2004] [Accepted: 01/10/2005] [Indexed: 11/24/2022]
Abstract
PURPOSE
Her-2/neu and p53-mediated signalling have been shown to interact at various cellular levels. However, the clinical relevance of p53 alterations in patients receiving trastuzumab for Her-2/neu-overexpressing metastatic breast cancer (MBC) remains unknown. The present study was performed to corroborate previous in vitro findings from our laboratory showing that trastuzumab induces growth arrest and apoptosis in a p53-independent manner.
METHOD
Retrospective immunohistochemical (IHC) analysis for p53 protein expression was carried out on tumour specimens from 104 patients receiving trastuzumab-based treatment for Her-2/neu-overexpressing MBC at a single institution. p53 status was correlated with response (R) and clinical benefit (CB), median progression-free survival (PFS) time and overall survival (OAS) time in univariate and multivariate analyses.
RESULTS
Characteristics were similar between p53-negative and p53-positive tumours (all P>0.05). In univariate analyses, R (39% vs 26%, P=0.208), CB (70% vs 57%, P=0.218), PFS (6.2 months vs 4.2 months, P=0.186) and OAS (23.8 months vs 23.2 months, P=0.650) were similar for p53-positive tumours and p53-negative tumours, respectively. In multivariate analyses, p53 status was not a significant predictor of R, CB, PFS or OAS (all P>0.05).
CONCLUSIONS
p53 status, as determined by IHC, is not a predictor of the clinical efficacy of trastuzumab-based treatment in patients with Her-2/neu-overexpressing MBC.
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