IJMS, Vol. 18, Pages 2420: Molecular-Targeted Therapies for Epidermal Growth Factor Receptor and Its Resistance Mechanisms

IJMS, Vol. 18, Pages 2420: Molecular-Targeted Therapies for Epidermal Growth Factor Receptor and Its Resistance Mechanisms

International Journal of Molecular Sciences doi: 10.3390/ijms18112420

Authors: Toshimitsu Yamaoka Motoi Ohba Tohru Ohmori

Cancer therapies targeting epidermal growth factor receptor (EGFR), such as small-molecule kinase inhibitors and monoclonal antibodies, have been developed as standard therapies for several cancers, such as non-small cell lung cancer, colorectal cancer, pancreatic cancer, breast cancer, and squamous cell carcinoma of the head and neck. Although these therapies can significantly prolong progression-free survival, curative effects are not often achieved because of intrinsic and/or acquired resistance. The resistance mechanisms to EGFR-targeted therapies can be categorized as resistant gene mutations, activation of alternative pathways, phenotypic transformation, and resistance to apoptotic cell death. Analysis of the processes that modulate EGFR signal transduction by EGFR-targeted inhibitors, such as tyrosine kinase inhibitors and monoclonal antibodies, has revealed new therapeutic opportunities and has elucidated novel mechanisms contributing to the discovery of more effective anticancer treatments. In this review, we discuss the roles of EGFR in cancer development, therapeutic strategies for targeting EGFR, and resistance mechanisms to EGFR-targeted therapies, with a focus on cancer therapies for individual patients.

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