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AstraZeneca COPD drug cuts flare-ups across all patient types in late-stage trials

AstraZeneca COPD drug cuts flare-ups across all patient types in late-stage trials

New Capabilities

Tozorakimab reduced moderate-to-severe exacerbations by up to 34% and worked regardless of eosinophil levels, unlike existing biologics

Yesterday: Results published in NEJM; FDA review underway

Overview

Updated 1 hour ago

Millions of COPD patients who don't respond to current biologic treatments may soon have a new option. AstraZeneca's tozorakimab cut moderate-to-severe flare-ups by 29% to 34% in two late-stage trials, and unlike existing biologics, it worked across all blood eosinophil levels.

The drug blocks IL-33, a protein that drives airway inflammation and mucus production. If approved, it would be the first COPD biologic available to patients with low eosinophil counts, expanding treatment to millions who currently have no biologic option.

Why it matters

If approved, tozorakimab would be the first COPD biologic that works regardless of eosinophil levels, giving millions of patients a new option.

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Key Indicators

29-34%
Reduction in moderate-to-severe COPD flare-ups (former smokers)
Primary endpoint in OBERON and TITANIA trials, compared with placebo on top of inhaled standard of care.
2,306
Patients randomized across both Phase III trials
Included current and former smokers across all eosinophil counts and lung function severities.
Q1 2027
Expected FDA decision (PDUFA date)
Biologics License Application accepted for Priority Review with a Priority Review voucher.
16-26M
Americans living with COPD
Diagnosed and undiagnosed cases, per AstraZeneca. COPD is the fifth-leading cause of death in the US.

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People Involved

Organizations Involved

Timeline

December 2024 September 2026

3 events Latest: Yesterday
  1. Results published in NEJM; FDA review underway

    Latest Publication

    Full results published in the New England Journal of Medicine. BLA under Priority Review with PDUFA date expected Q1 2027.

  2. Tozorakimab Phase III results presented at ERS 2026

    Clinical Trial

    AstraZeneca presented OBERON and TITANIA results in Barcelona, showing 29-34% reduction in moderate-to-severe COPD flare-ups in former smokers.

  3. FDA grants Fast Track designation for tozorakimab in COPD

    Regulatory

    The FDA granted Fast Track designation for tozorakimab as a COPD treatment, speeding up development and review.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

2019-2026

IL-33 inhibitor struggles (2019-2026)

Multiple companies pursued IL-33 inhibitors for respiratory disease with limited success, leading investors and researchers to question whether the target was viable. Roche's astegolimab remains in Phase III.

Then

Several programs stalled or failed to meet endpoints.

Now

IL-33 became seen as a risky target for respiratory biologics.

Why this matters now

Tozorakimab's Phase III success suggests its dual-pathway mechanism may overcome the limitations of earlier IL-33 drugs.

September 2024

Dupixent COPD approval (2024)

Sanofi and Regeneron's dupilumab (Dupixent) became the first biologic approved for COPD, but only for patients with high blood eosinophil counts. The approval followed trials showing reduced exacerbations in that subset.

Then

Dupixent became the standard biologic for eosinophilic COPD.

Now

It established biologics as a COPD treatment but left most patients without a biologic option.

Why this matters now

Tozorakimab aims to expand biologic treatment to all COPD patients, including the majority who don't qualify for Dupixent.

Sources

(11)