Fig. 2.

Classifier validation. To validate the 6-gene classifier, we classified patients from 4 independent datasets. (A) Mixed adenocarcinomas and squamous cell carcinomas profiled with Affymetrix HG-U133Plus2 arrays by Potti et al. (15). (B) Adenocarcinomas profiled on cDNA arrays by Larsen et al. (13). (C) Squamous cell carcinomas profiled on Affymetrix HG-U133A arrays by Raponi et al. (16). (D) Squamous cell carcinomas profiled on cDNA arrays by Larsen et al. (14). The number of patients at risk in each molecularly-defined group is indicated at several time points. The stage-adjusted hazard ratio (HR), P value (Wald test), and the number of patients successfully classified (N) are also shown.