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. Author manuscript; available in PMC: 2014 Jul 15.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2013 Mar 20;22(5):891–897. doi: 10.1158/1055-9965.EPI-12-1238

Figure 3.

Figure 3

Plot of the first 2 principal components, computed from all 517 genes on 639 tumor samples (270 AAM, 369 EAM) and 165 control samples (82 AAM, 83 EAM). Although all of the control samples had a matching tumor sample and thus are expected to be highly correlated with the respective tumor sample, the samples clustered by tumor/control status, regardless of race. This implies that the expression profile of the tumor samples is similar across races and different than the profile of the control samples, which are also similar across races.