Correlation of EphA2 gene expression with sensitivity to dasatinib. (a) Negative correlation between the expression levels of EphA2 (black diamonds) and the IC50 (gray circles) values for the 16 cell lines. The coefficient of the Pearson correlation is -0.66, indicating a high reverse correlation. (b) Expression of EphA2 protein in five sensitive and three resistant cell lines. Overall, the protein expression levels in these cell lines correlated well with the mRNA levels detected by microarray analysis.