Figure 2From: Molecular pathways undergoing dramatic transcriptomic changes during tumor development in the human colon Hierarchical clustering and PCA of data sets based on cell cycle gene expression. Heat maps in panels A, B, and C show expression levels for the Biocarta cell cycle pathway’s 22 gene components (listed on the right) across samples in the 3 tumor-stage-specific data subsets: SPLs, LPLs, and CRCs, respectively (each containing corresponding samples of normal mucosa, N). Actual sample labels are shown at the top of each heat map (0=normal mucosa; 1=tumor); the groups identified by hierarchical clustering analysis are separated by vertical white lines. (Dendrograms are not shown.) (D) Bi-dimensional projection via PCA of all tumors and normal mucosal specimens using expression levels for the 22 cell cycle-related genes. Each dot represents a tissue sample (pink circle: N; yellow star: SPL; green diamond: LPL; blue square: CRC). The first two components, PC1 and PC2, account for 81% of the variance in this set.Back to article page