Epidermal growth factor receptor pathway gene expressions and biological response of glioblastoma multiforme cell lines to erlotinib.

Background: Erlotinib, an epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor, exerts highly variable antiproliferative effects on human glioblastoma multiforme (GBM) cells in vitro and in vivo. As these effects are independent of EGFR baseline expression levels, more complex genetic signatures may form the molecular basis of the erlotinib-sensitive and erlotinib-resistant GBM phenotypes. The aim of the current study was to determine which genes within the EGFR signaling pathway are candidates for mediating the cellular response of human GBM towards erlotinib.