Figure 4

Two-way hierarchical clustering of allelotyping rectal and colon tumors. Vertical columns correspond to microsatellites, horizontal lines correspond to tumors. Red squares correspond to loci with allelic imbalance, green squares to normal loci, and grey squares to non-informative. A) Left colon tumors (n = 151) mixed with rectal tumors (n = 33). Dots correspond to rectal tumors without preoperative treatment. B) Dendrogram of left colon tumors (cluster not shown). C) Dendrogram of rectal tumors without preoperative treatment (from Figure 2). For B) and C) Arrows and dots: examples of loci associated in the left colon tumors but not associated in rectal tumors. Asterisks: loci associated in rectal tumors but not in left colon tumors.