AstraZeneca PLCSonesitatug vedotin met primary endpoint of overall survival in Phase III trial, a potential first-in-class ADC.

AstraZeneca's sonesitatug vedotin demonstrated a statistically significant and highly clinically meaningful improvement in overall survival in the CLARITY-Gastric01 Phase III trial for patients with CLDN18.2-positive advanced gastric or gastroesophageal junction cancers. The trial met its dual primary endpoint of overall survival in the third and later-line setting and a key secondary endpoint of overall survival in the overall second and later-line population, while progression-free survival showed a trend toward improvement but did not reach statistical significance. The study enrolled patients with CLDN18.2 expression on at least 25% of tumor cells, a threshold that could expand eligibility to approximately 60% of patients in this setting. Sonesitatug vedotin is a potential first-in-class CLDN18.2-targeting antibody drug conjugate with an MMAE payload, and these results mark the first Phase III readout from AstraZeneca's wholly owned ADC portfolio. The safety profile was consistent with prior findings, and the data will be presented at a forthcoming medical meeting and shared with global regulators.
AstraZeneca PLCSonesitatug vedotin met primary endpoint of overall survival in Phase III trial, a potential first-in-class ADC.