Article Search

The MATTERHORN trial assessed patients with resectable gastric cancer/gastroesophageal junction cancer and assigned them 1:1 to perioperative durvalumab 1500 mg Q4W + FLOT (neoadjuvant and adjuvant) vs placebo + FLOT. Durvalumab + FLOT significantly improved 2-yr EFS (67.4% vs 58.5%) and increased pathological complete response (pCR) (19.2% vs 7.2%), with a numerically higher 2-year overall survival (OS) (75.7% vs 70.4%). Safety was comparable between arms (grade 3–4 AEs 71.6% vs 71.2%) with no excess surgical delays, unexpected toxicities or adjuvant initiation delays. Bottom line: Immunotherapy (IO) benefit appears linked to the FLOT backbone—as cis/FP + IO regimens have not consistently improved event-free survival (EFS)—and mature OS plus broader representation remain needed, but this looks like a meaningful advance.