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AstraZeneca’s rare disease drug misses main goal in late-stage trial

By Thomson Reuters Jul 27, 2026 | 2:01 AM

July 27 (Reuters) – AstraZeneca said on Monday its rare disease drug Ultomiris failed a late-stage trial in patients with a blood vessel complication following a ​stem cell transplant, the latest in a series ‌of setbacks this year that have fuelled concerns about the drugmaker’s pipeline.

Here are some details:

• Ultomiris did not achieve statistical significance for event-free survival at 26 weeks in patients with haematopoietic stem cell transplant-associated ‌thrombotic ​microangiopathy, though it showed a trend ⁠toward benefit.

• AstraZeneca said ⁠it is in ongoing discussions with global health authorities over potential next steps for the adult indication.

• In a separate trial involving children, Ultomiris showed an overall ​survival rate of 87.2% at 26 weeks and 73.4% at 52 weeks, and the drugmaker said it will ⁠advance regulatory filings for use in ⁠children.

• The data comes on the heels ​of a failed pivotal heart-disease trial earlier this month, which ​have cast doubts over the drugmaker’s trial design.

• In ‌May, a U.S. regulatory panel rejected its breast cancer drug camizestrant on trial design grounds.

• AstraZeneca also reported that its experimental gastric cancer drug sonesitatug vedotin met a ⁠key goal, showing a statistically significant and clinically meaningful improvement in overall survival in advanced gastric cancer patients.

• The drugmaker, which ⁠topped second-quarter profit ‌expectations on strong demand for its cancer ⁠and rare disease therapies, is counting on ​up to ‌20 new drug launches to help generate $80 ​billion in ⁠annual revenue by 2030.

• Ultomiris, known chemically as ravulizumab, is already approved in the United States, the EU and Japan for treating certain rare blood disorders and neurological conditions.

(Reporting by Raechel Thankam Job in Bengaluru; Editing by Mrigank Dhaniwala ​and Nivedita Bhattacharjee)