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Polyrizon begins US NASARIX trial, marking transition to clinical-stage

Sep 22, 2026, 8:47 AM EDT1 sourcesAI-analyzed

Why it may matterVerify against the original reporting

Clinical milestone moving from preclinical to first-in-human US study often triggers upside for biotech, especially when a clear, near-term data readout is outlined. Historically, similar milestones (e.g., first patient dosed) have led to stock bows and subsequent volatility as investors price in potential timelines and probabilities of success.

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Polyrizon announced the enrollment of the first U.S. patient for NASARIX (PL-14), advancing the company into clinical-stage development. The multicenter trial will randomize 120 adults across five sites against saline, evaluating efficacy, safety and tolerability with the primary endpoint of mean daily rTNSS over two weeks. Positive results could enable further trials and potential market adoption of a drug-free allergy option.

First U.S. patient enrolled in NASARIX (PL-14) trial.
120 patients across 5 U.S. sites, randomized 1:1 vs saline.
Milestone marks Polyrizon’s transition to clinical-stage development.
NASARIX is a non-pharmacological, drug-free nasal barrier.
Primary endpoint: change in mean daily rTNSS over 14 days.

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