The present invention describes polynucleotides that have been discovered to correlate to the relative intrinsic sensitivity or resistance of cells, e.g., 
lung cell lines, to treatment with compounds that interact with and modulate, e.g., inhibit, 
protein tyrosine kinases, such as, for example, members of the 
Src family of 
tyrosine kinases, e.g., Src, Fgr, Fyn, Yes, Blk, Hck, Lck and Lyn, as well as other 
protein tyrosine kinases, including, Bcr-
abl, Jak, PDGFR, c-kit and Ephr. These polynucleotides have been shown, through a weighted voting 
cross validation program, to have utility in predicting the resistance and sensitivity of 
lung cell lines to the compounds. The expression level of some polynucleotides is regulated by treatment with a particular 
protein tyrosine kinase inhibitor compound, thus indicating that these polynucleotides are involved in the protein 
tyrosine kinase signal transduction pathway, e.g., Src 
tyrosine kinase. Such polynucleotides, whose expression levels correlate highly with 
drug sensitivity or resistance and which are modulated by treatment with the compounds, comprise 
polynucleotide predictor or marker sets useful in methods of predicting 
drug response, and as prognostic or diagnostic indicators in 
disease management, particularly in those 
disease areas, e.g., 
lung cancer, in which signaling through the protein tyrosine 
kinase pathway, such as the Src tyrosine 
kinase pathway, is involved with the 
disease process.