Journal Article
. 2006 Mar;24(11).
doi: 10.1200/JCO.2005.03.9115.

Multicenter validation of a gene expression-based prognostic signature in lymph node-negative primary breast cancer

John A Foekens 1 David Atkins  Yi Zhang  Fred C G J Sweep  Nadia Harbeck  Angelo Paradiso  Tanja Cufer  Anieta M Sieuwerts  Dmitri Talantov  Paul N Span  Vivianne C G Tjan-Heijnen  Alfredo F Zito  Katja Specht  Heinz Hoefler  Rastko Golouh  Francesco Schittulli  Manfred Schmitt  Louk V A M Beex  Jan G M Klijn  Yixin Wang  
  • PMID: 16505412
  •     80 citations


Purpose: We previously identified in a single-center study a 76-gene prognostic signature for lymph node-negative (LNN) breast cancer patients. The aim of this study was to validate this gene signature in an independent more diverse population of LNN patients from multiple institutions.

Patients And Methods: Using custom-designed DNA chips we analyzed the expression of the 76 genes in RNA of frozen tumor samples from 180 LNN patients who did not receive adjuvant systemic treatment.

Results: In this independent validation, the 76-gene signature was highly informative in identifying patients with distant metastasis within 5 years (hazard ratio, [HR], 7.41; 95% CI, 2.63 to 20.9), even when corrected for traditional prognostic factors in multivariate analysis (HR, 11.36; 95% CI, 2.67 to 48.4). The actuarial 5- and 10-year distant metastasis-free survival were 96% (95% CI, 89% to 99%) and 94% (95% CI, 83% to 98%), respectively, for the good profile group and 74% (95% CI, 64% to 81%) and 65% (53% to 74%), respectively for the poor profile group. The sensitivity for 5-yr distant metastasis-free survival was 90%, and the specificity was 50%. The positive and negative predictive values were 38% (95% CI, 29% to 47%) and 94% (95% CI, 86% to 97%), respectively. The 76-gene signature was confirmed as a strong prognostic factor in subgroups of estrogen receptor-positive patients, pre- and postmenopausal patients, and patients with tumor sizes 20 mm or smaller. The subgroup of patients with estrogen receptor-negative tumors was considered too small to perform a separate analysis.

Conclusion: Our data provide a strong methodologic and clinical multicenter validation of the predefined prognostic 76-gene signature in LNN breast cancer patients.

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