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