Figure 4

Principal component analysis (PCA) of protein expression profiles of the renal set. Protein expression profiles depicted as PCA plots were generated using lysates from frozen (left) or FFPE preparations (right) spotted on protein arrays using the RPPA approach. The ellipses were centered based on the means of the first and second principal components for each group (normal or tumor), and drawn using the variation factors that are the products of the eigenvector and the square root of eigenvalues calculated from the variances and covariances of the first and second principal components. The two groups are separated, as indicated by their means.