AMGEN ANNOUNCES POSITIVE TOPLINE PHASE 3 RESULTS FOR SUBCUTANEOUS TEPEZZA® IN ADULTS LIVING WITH MODERATE-TO-SEVERE ACTIVE THYROID EYE DISEASE

Primary and Key Secondary Endpoints Met

77% of Patients Achieved Highly Statistically Significant Proptosis Response

Study Showed Clinically Meaningful Reduction in Proptosis; Greater Than 3 mm

THOUSAND OAKS, Calif., April 6, 2026 /PRNewswire/ -- Amgen (NASDAQ: AMGN) today announced positive topline results from a Phase 3 trial of TEPEZZA (teprotumumab-trbw) administered by subcutaneous injection via an on-body injector (OBI) in participants with moderate-to-severe active Thyroid Eye Disease (TED). TEPEZZA OBI provides comparable efficacy to, and builds upon the success of, intravenous (IV) TEPEZZA, the first and only medicine approved for the treatment of TED, which has now treated more than 25,000 patients worldwide.

The Phase 3 TEPEZZA OBI trial met its primary endpoint in moderate-to-severe active TED, showing a statistically significant and clinically meaningful 77% proptosis response rate during the 24-week placebo-controlled period (76.7% TEPEZZA OBI vs. 19.6% placebo [p