70 gene signature correlation values between three laboratories. 70-gene signature correlation values for the four tumors were determined for each hybridization done in three different laboratories. On the x-axis are the four different tumor samples, and on the y-axis are the correlation values for each dye-swapped pair. Green data points were labeled and hybridized in Paris, red data points were labeled in Amsterdam, and blue data points were labeled in California. The mean correlation values at each hybridization location, and the ANOVA P values when grouped by labeling and hybridization site are shown beneath the plot.