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EGFR-TKIs resistance via EGFR-independent signaling pathways
Qian Liu (Tongji Hospital, Huazhong University of Science and Technology), Shengnan Yu (Tongji Hospital, Huazhong University of Science and Technology), Weiheng Zhao (Tongji Hospital, Huazhong University of Science and Technology), Shuang Qin (Tongji Hospital, Huazhong University of Science and Technology), Qian Chu (Tongji Hospital, Huazhong University of Science and Technology), Kongming Wu (Tongji Hospital, Huazhong University of Science and Technology)
Abstract: Tyrosine kinase inhibitors (TKIs)-treatments bring significant benefit for patients harboring epidermal growth factor receptor (EGFR) mutations, especially for those with lung cancer. Unfortunately, the majority of these patients ultimately develop to the acquired resistance after a period of treatment. Two central mechanisms are involved in the resistant process: EGFR secondary mutations and bypass signaling activations. In an EGFR-dependent manner, acquired mutations, such as T790 M, interferes the interaction between TKIs and the kinase domain of EGFR. While in an EGFR-independent manner, dysregulation of other receptor tyrosine kinases (RTKs) or abnormal activation of downstream compounds both have compensatory functions against the inhibition of EGFR through triggering phosphatidylinositol 3-kinase (PI3K)/Akt and mitogen-activated protein kinase (MAPK) signaling axes. Nowadays, many clinical trials aiming to overcome and prevent TKIs resistance in various cancers are ongoing or completed. EGFR-TKIs in accompany with the targeted agents for resistance-related factors afford a promising first-line strategy to further clinical application.