Nektar Therapeutics Reports Positive 52-Week Phase 2b Results for Rezpegaldesleukin in Alopecia Areata, Advancing to Phase 3
NKTR has more than doubled off its 52-week low of $7.99.
Summary
Nektar Therapeutics announced positive 52-week Phase 2b results for rezpegaldesleukin in severe alopecia areata, showing deepening of responses and a favorable safety profile, paving the way for Phase 3 development.
Key Events · Product Development and Regulatory · NKTR
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Positive 52-Week Phase 2b Results
The REZOLVE-AA study of rezpegaldesleukin in severe-to-very-severe alopecia areata demonstrated positive 52-week topline results, showing deepening of clinical responses with continued treatment.
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Statistically Significant Efficacy
At week 52, 25.8% (low dose) and 27.6% (high dose) of patients achieved SALT Score ≤20 (80%+ hair coverage) versus 6.7% for placebo (p=0.049). Similarly, 30.2% (low dose) and 35.0% (high dose) achieved SALT Score ≤30 (70%+ hair coverage) versus 8.4% for placebo (p=0.023).
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Favorable Safety Profile Maintained
A favorable safety and tolerability profile was observed over 52 weeks, consistent with prior studies. Nearly all treatment-emergent adverse events were mild-to-moderate, with 94% of patients completing the extension period and no discontinuations due to adverse events.
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Advancement to Phase 3 Development
The positive results support the advancement of rezpegaldesleukin into late-stage development. The company plans an End of Phase 2 meeting with the FDA in Q2 2026 to align on the Phase 3 registrational strategy.
Analysis · NKTR · Life Sciences
Nektar Therapeutics has announced highly positive 52-week topline results from its REZOLVE-AA Phase 2b study for rezpegaldesleukin in severe-to-very-severe alopecia areata. The data demonstrates a deepening of clinical responses over time, with statistically significant improvements in hair regrowth (SALT scores) compared to placebo. Crucially, the drug maintained a favorable safety and tolerability profile throughout the 52-week treatment period, which is a key differentiator from existing treatments like JAK inhibitors. These robust results are critical as they support the advancement of rezpegaldesleukin into Phase 3 development, a major milestone that significantly de-risks the program and could transform the treatment landscape for alopecia areata. This positive news reinforces the company's pipeline strength and comes as the stock is trading near its 52-week high, suggesting strong investor confidence in its clinical programs.
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At the time of this filing, NKTR was trading at $104.19 on NASDAQ in the Life Sciences sector, with a market capitalization of approximately $2.4B. The 52-week trading range was $7.99 to $86.95. This filing was assessed with positive market sentiment and an importance score of 9 out of 10.