KEYNOTE-585 Fails While Matterhorn Succeeds in Gastric Cancer: What Lessons Can We Learn?

Ilson, David H · J Clin Oncol · 2025

editorial · Level V

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Abstract

In the article that accompanies this editorial, the KEYNOTE-585 trial demonstrated that adding pembrolizumab to perioperative chemotherapy with 5-FU and cisplatin in resectable esophagogastric cancer improved pathologic complete response rate but did not significantly improve event free survival over chemotherapy alone, despite trends toward improvement in both event free and overall survival. Although a negative trial, results from KEYNOTE-585 support and reinforce the positive results recently reported from the MATTERHORN Trial, which establishes a new care standard adding durvalumab to perioperative FLOT chemotherapy in resectable esophagogastric cancer.