Processes that are activated by EGFR stimulation include signal transduction pathways for PI3K-Akt (related to survival and apoptosis evasion) and Ras-Raf-MEK-MAPK (relating to proliferation).15 In addition, there is an interaction between EGFR expression and signal transducers and activators of transcription 3 (eg, STAT3), which play a role in the regulation of transcription of genes involved in cell cycle progression such as Fos, Cyclin-D, CDC25A, c-Myc and Pim1 and the upregulation of antiapoptotic genes such as BCL2.16,17
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