Genes identified by linear discriminant analysis. The top 70 PCA coefficients along the third principal component were selected. Panel A: Plot of linear discriminant profile of 70 probes that distinguish xenograft tumors from parental cell lines. Positive values in orange indicate "Xenograft tumor" while negative values in blue indicate "Parental Cell line". The y-axis shows either numbered tumor (left) or parental cell (right) samples and the x-axis is an arbitrarily scaled output reflecting the accuracy in assigning a sample as a xenograft tumor or parental cell line. The numbered tumors were grouped according to tissue type as indicated by C for colon (HCT116), B for breast (MDA MB-231), L for lung (A549), P for prostate (PC3) and O for ovary (SKOV-3). Panel B: Graphical representation of the LD-p54 genes expression profiles. For genes with multiple probes, the highest value is shown. Classified by a non-redundant filtering of the Gene Ontology biological process terms, the genes are shown with a color scale representing relative fold induction to all parental cell line data. The left-most color column designated by 'X' is the average ratio, while the remaining five columns correspond to Colon (HCT116), Breast (MDA MB-231), Lung (A549), Prostate (PC3) and Ovarian (SKOV-3) carcinoma xenografts respectively.