Distribution of IL-8 related genes in tumor cDNA libraries. The percentage ratio of IL-8-tumor clones/IL-8 clones (Rtumor) was calculated for each IL-8 related gene. The result is plotted here with gene id on the x-axis and Rtumor on the y-axis. A bimodal distribution is obtained where most genes are either highly associated (>80%) with tumor libraries or they show very little association (<10%) with tumor libraries. Five genes have an Rtumor value of >95%: KLF2 (99.5%), PS1 (98.9%), NPDC1 (97.9%), GW112 protein (97.4%), and claudin-3 (96.6%).