The Cover

Cluster analysis of the drug-resistant gastric cancer cell lines (vertical axis) and genes selected for fold-change (>1.5- fold) and Wilcoxon’s test in three out of four 5-FU-, or all doxorubicin- and cisplatin-resistant cell lines (horizontal axis). When we performed clustering analysis between all drugresistant cell lines and the differentially expressed genes by high-density oligonucleotide microarray, we observed that the doxorubicin-resistant cell lines were clustered together.