The therapeutic landscape for gastric and gastroesophageal junction (G/GEJ) cancer is rapidly evolving, with biomarkers directing treatment selection. Recent evidence suggests that the combination of HER2-targeted therapies and immune checkpoint inhibitors has synergistic effects, highlighting the importance of the most recent clinical data regarding first-line treatments for advanced or metastatic G/GEJ cancers and the differentiation between HER2-positive and -negative tumors. In addition to HER2, Claudin 18 splice variant 2 (CLDN18.2) has emerged as a new biomarker for targeted treatment. Multiple factors should be considered in first-line treatment selection, including biomarker positivity, performance status, and potential toxicity. In this program, topics presented by expert faculty will illustrate the biomarker-related clinicopathologic features of G/GEJ cancers as well as how to incorporate the latest evidence to individualize first-line treatment for patients with G/GEJ cancers.
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