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Association of ERBB2 Copy Number and Gene Coalterations With Trastuzumab Efficacy and Resistance in Human Epidermal Growth Factor Receptor 2-Positive Esophagogastric and Gastric Cancer.
JCO Precis Oncol. 2022 Aug;6:e2200135.
DOI: 10.1200/PO.22.00135.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9384954/