Jasper Therapeutics Reports Positive Updated Data from Briquilimab Studies in Chronic Spontaneous Urticaria

67% of additional patients (n=6) enrolled in the BEACON study achieved a complete response at 12 weeks with a mean UAS7 reduction of 31 points 

75% of CSU participants (n=36) enrolled in the open label extension study achieved a complete response or well controlled disease at 12 weeks

With a median duration of follow up of more than 200 days on 63 participants in the open label extension study, KIT related AEs were low in frequency and predominantly low-grade events that resolved while on study

BEACON and open label extension data sets are now sufficient to select doses for the Phase 2b study of briquilimab in CSU planned to commence in the second half of 2026

Excerpt from the Press Release:

REDWOOD CITY, Calif., Jan. 08, 2026 (GLOBE NEWSWIRE) — Jasper Therapeutics, Inc. (Nasdaq: JSPR) (Jasper), a clinical stage biotechnology company focused on development of briquilimab, a novel antibody therapy targeting KIT (CD117) to address mast cell driven diseases such as chronic spontaneous urticaria (CSU), chronic inducible urticaria (CIndU) and asthma, is reporting positive updated clinical data from Jasper’s BEACON Phase 1b/2a study of subcutaneous briquilimab in adult participants with CSU, as well as from the open label extension study in CSU and CIndU. Treatment with briquilimab resulted in rapid disease control in the additional participants enrolled in the 240mg / 180mg Q8W cohort (n=6) in the BEACON study, with 83% of participants achieving a complete response by week 3 after the initial 240mg dose, and 67% reporting a complete response at 12 weeks. Similarly high levels of efficacy were demonstrated in the open-label extension study evaluating a 180mg Q8W dosing regimen, with 58% of CSU participants (n=36) achieving a complete response at 12 weeks.

“We are very pleased to present data from additional patients enrolled in the BEACON study, which reaffirms the potential of briquilimab to drive rapid and durable disease control in patients with CSU,” said Dr. Daniel Adelman, Acting Chief Medical Officer of Jasper. “We are also pleased by the performance of the 180mg Q8W dose in the open label extension study, with the strong efficacy observed in CSU and CIndU patients. Taken together with the favorable safety and tolerability profile observed in both studies, we believe these data are sufficient to support a differentiated profile for briquilimab in chronic urticaria. On behalf of the Jasper team, I’d like to thank the investigators and the patients who participated in the study, along with their families and caregivers.”

BEACON Study Design and Updated Data Summary:

The BEACON study is a randomized, double-blind, and placebo-controlled Phase 1b/2a trial evaluating multiple ascending doses of subcutaneous briquilimab as a therapy for adult patients with moderate to severe CSU despite treatment with high dose antihistamines.

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