Rose, B. E., Grewal, U. S., Ruan, P., Ozer, M., Hornstein, N. J., Bawek, S., Vadehra, D., Verma, N., Jones, A. L., Porembka, M. R., Sanford, N. N., Wang, S. C., Kazmi, S. M. A., Brown, T. J. (2026). HER2 discordance in upper gastrointestinal cancers in a US-based analysis.. Journal of Clinical Oncology. https://doi.org/10.1200/jco.2026.44.16_suppl.e16086