Predictive value of tumor Ki-67 expression in two randomized trials of adjuvant chemoendocrine therapy for node-negative breast cancer

Giuseppe Viale, Meredith M. Regan, Mauro G. Mastropasqua, Fausto Maffini, Eugenio Maiorano, Marco Colleoni, Karen N. Price, Rastko Golouh, Tiziana Perin, R. W. Brown, Anikó Kovács, Komala Pillay, Christian Öhlschlegel, Barry A. Gusterson, Monica Castiglione-Gertsch, Richard D. Gelber, Aron Goldhirsch, Alan S. Coates

Research output: Contribution to journalArticlepeer-review

Abstract

Several small studies have reported that having a high percentage of breast tumor cells that express the proliferation antigen Ki-67 (ie, a high Ki-67 labeling index) predicts better response to neoadjuvant chemotherapy. However, the predictive value of a high Ki-67 labeling index for response to adjuvant chemotherapy is unclear. To investigate whether Ki-67 labeling index predicts response to adjuvant chemoendocrine therapy, we assessed Ki-67 expression in tumor tissue from 1924 (70%) of 2732 patients who were enrolled in two randomized International Breast Cancer Study Group trials of adjuvant chemoendocrine therapy vs endocrine therapy alone for node-negative breast cancer. A high Ki-67 labeling index was associated with other factors that predict poor prognosis. Among the 1521 patients with endocrine-responsive tumors, a high Ki-67 labeling index was associated with worse disease-free survival but the Ki-67 labeling index did not predict the relative efficacy of chemoendocrine therapy compared with endocrine therapy alone. Thus, Ki-67 labeling index was an independent prognostic factor but was not predictive of better response to adjuvant chemotherapy in these studies.

Original languageEnglish
Pages (from-to)207-212
Number of pages6
JournalJournal of the National Cancer Institute
Volume100
Issue number3
DOIs
Publication statusPublished - Feb 2008

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

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