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Bayer’s Asundexian Succeeds in Phase III Stroke-Prevention Trial, Shares Jump More Than 8%

Topline results position Bayer to seek approvals following risk reduction without more major bleeding in a 12,300-patient trial.

The logo of Bayer at the company’s booth at the 8th China International Import Expo (CIIE) in Shanghai, China, November 6, 2025. REUTERS/Maxim Shemetov/File Photo
The 120 metres high Bayer Cross, logo of German pharmaceutical and chemical maker Bayer AG, in Leverkusen, Germany, September 23, 2023. REUTERS/Wolfgang Rattay

Overview

  • In OCEANIC-STROKE, asundexian 50 mg once daily plus antiplatelet therapy significantly lowered ischemic stroke risk versus placebo in patients after a non-cardioembolic ischemic stroke or high-risk TIA.
  • The trial met its primary safety endpoint with no increase in ISTH major bleeding compared with placebo.
  • The study was international, randomized, double-blind, placebo-controlled, event-driven, and enrolled more than 12,300 participants.
  • Bayer said it will engage health authorities worldwide to prepare marketing authorization applications, with full data to be presented at an upcoming scientific congress.
  • Bayer shares rose more than 8% after the announcement, reversing sentiment following a 2023 failure in an atrial fibrillation study.