Medline ® Abstract for Reference 136
of 'Prognostic and predictive factors in early, nonmetastatic breast cancer'
Ki-67 as prognostic marker in early breast cancer: a meta-analysis of published studies involving 12,155 patients.
de Azambuja E, Cardoso F, de Castro G Jr, Colozza M, Mano MS, Durbecq V, Sotiriou C, Larsimont D, Piccart-Gebhart MJ, Paesmans M
Br J Cancer. 2007;96(10):1504. Epub 2007 Apr 24.
The Ki-67 antigen is used to evaluate the proliferative activity of breast cancer (BC); however, Ki-67's role as a prognostic marker in BC is still undefined. In order to better define the prognostic value of Ki-67/MIB-1, we performed a meta-analysis of studies that evaluated the impact of Ki-67/MIB-1 on disease-free survival (DFS) and/or on overall survival (OS) in early BC. Sixty-eight studies were identified and 46 studies including 12 155 patients were evaluable for our meta-analysis; 38 studies were evaluable for the aggregation of results for DFS, and 35 studies for OS. Patients were considered to present positive tumours for the expression of Ki-67/MIB-1 according to the cut-off points defined by the authors. Ki-67/MIB-1 positivity is associated with higher probability of relapse in all patients (HR=1.93 (95% confidence interval (CI): 1.74-2.14); P<0.001), in node-negative patients (HR=2.31 (95% CI: 1.83-2.92); P<0.001) and in node-positive patients (HR=1.59 (95% CI: 1.35-1.87); P<0.001). Furthermore, Ki-67/MIB-1 positivity is associated with worse survival in all patients (HR=1.95 (95% CI: 1.70-2.24; P<0.001)), node-negative patients (HR=2.54 (95% CI: 1.65-3.91); P<0.001) and node-positive patients (HR=2.33 (95% CI: 1.83-2.95); P<0.001). Our meta-analysis suggests that Ki-67/MIB-1 positivity confers a higher risk of relapse and a worse survival in patients with early BC.
Medical Oncology Clinic, Jules Bordet Institute, 125 Boulevard de Waterloo, 1000, Brussels, Belgium.