Abstract
Pancreatic Ductal Adenocarcinoma (PDAC) is among the most lethal solid tumors with grim prognosis. This dismal outcome can partially be explained by the resistance to currently available chemotherapy regimens or the failure of most anticancer agents, which prompted the development of new and effective therapeutic-approaches, such as inhibitors of the epidermal growth factor receptor (EGFR). Some of these EGFR inhibitors (e.g., erlotinib) are approved for lungcancer, however available data are inconclusive for treatment of pancreatic cancer patients with EGFR-targeted-therapies. Here we describe the critical role of EGFR pathway in pancreatic-cancer, strategies to enhance the effectiveness of EGFRinhibitors as well as the preclinical/clinical studies with particular emphasis on recent findings with monoclonal antibodies and tyrosine-inhibitors. Several combinations of EGFR inhibitors with other agents illustrate inhibition of tumor-induced angiogenesis and cell growth. Moreover, combination of erlotinib with gemcitabine showed statistically significance in overall-survival, compared to gemcitabine-alone. However high cost, little survival gain and increased risk of toxicities have limited its efficacy. Considering the multiple genetic mutations and the crosstalk of signaling pathways, (1) development of multiple targeted-therapies; (2) identification of predictive-biomarkers; and (3) those patients who are most likely benefit from therapy, could provide valuable direction for the clinical development of EGFR inhibitors. Moreover further preclinical/clinical studies are warranted to identify determinants of the activity of EGFR-inhibitors and mechanisms leading to resistance to EGFR inhibitors, through the analysis of genetic and environmental alterations affecting EGFR and parallel pro-cancer pathways. These studies will be critical to improve the efficacy and selectivity of current anticancer strategies targeting EGFR in pancreatic cancer.
Keywords: EGFR, EGFR-targeted-therapies, pancreatic cancer, resistance mechanisms.
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