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p27(Kip1) is a predictive factor for tamoxifen treatment response but not a prognostic marker in premenopausal breast cancer patients.

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Author

  • Maria Stendahl
  • Sofie Björner
  • Caroline Wigerup
  • Karin Jirström
  • Per-Ebbe Jönsson
  • Olle Stål
  • Göran Landberg

Summary, in English

The cell cycle regulating protein p27(Kip1) (p27) has dual roles by acting as both a cdk-inhibitor and as an assembly factor for different cdk-complexes. Loss of p27 has been linked to malignant features in tumours, however the exact role of p27 deregulation in breast cancer regarding prognostic and treatment predictive information has not been fully clarified. We have evaluated p27 expression in 328 primary, stage II breast cancers from premenopausal patients who had been randomised to either tamoxifen treatment or no adjuvant treatment after surgery. p27 was associated with the oestrogen receptor (ER) and cyclin D1, and p27 downregulation was associated with high proliferation. There was no association between recurrence-free-survival (RFS) and p27 (HR=0.800, 95%CI 0.523-1.222, p=0.300), indicating that p27 is not a prognostic marker. The predictive value of p27 was analysed by comparing RFS in tamoxifen treated and untreated patients in subgroups of low and high p27 expression (HR=0.747, 95%CI 0.335-1.664, p=0.474 and HR=0.401, 95%CI 0.240-0.670, p<0.001, respectively). Only patients with p27 high tumours benefited from tamoxifen (multivariate interaction analysis p=0.034). Our study suggests that p27 downregulation is associated with tamoxifen resistance in premenopausal breast cancer but is not linked to impaired prognosis. (c) 2010 UICC.

Publishing year

2010

Language

English

Pages

2851-2858

Publication/Series

International Journal of Cancer

Volume

Apr 7

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Cancer and Oncology

Status

Published

Research group

  • Pathology, Malmö
  • Surgery

ISBN/ISSN/Other

  • ISSN: 0020-7136