A. Expression of GLI transcription factors are significantly increased in EGFR dependent cells chronically treated with 10μM erlotinib. B. Erlotinib resistant cells highly express pro-EMT genes after removal from selection media. C. Percentage of Vim-positive cells is significantly increased in erlotinib resistant cell lines, measured by flow cytometry D. Erlotinib resistant cells are not sensitized to HhP inhibition by IPI-926. Cells were treated with erlotinib (1,5,10μM) or IPI-926 (1,5,10μM) and proliferation was measured by the SRB assay. Sensitivity to erlotonib decreased in resistant cells while sensitivity to IPI-926 was unchanged. *P<0.05, **P<0.01.