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Despite recent advances in the treatment of metastatic colorectal cancer (mCRC), 5 years survival rates remain low. Chemotherapy remains as the mainstay of treatment with only few available targeted therapies. Human epidermal growth factor receptor 2 (HER2) amplification occurs in approximately 5% of metastatic colorectal cancer and it has been studied as a mechanism of resistance for anti-epidermal growth factor receptor (EGFR) therapy. Furthermore, several studies such as HERACLES-A, MyPathway and the DESTINY-CRC01 trials have shown significant clinical benefit of HER2 blockade in patients with HER2 amplified mCRC. In this review, we provide an overview of the clinicopathological features of HER2 amplification and mutations in mCRC. In addition, we review HER2 as a biomarker of intrinsic and acquired anti-EGFR resistance as well as the preclinical, clinical and translational studies investigating the use of HER2 targeted therapies and future studies. Copyright © 2022 Elsevier Ltd. All rights reserved.

Citation

Ali Abdulnabi Mohamed, David K Lau, Ian Chau. HER2 targeted therapy in colorectal cancer: New horizons. Cancer treatment reviews. 2022 Apr;105:102363

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PMID: 35228040

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