KT-621 long-term safety and efficacy in asthma patients previously in KT-621 study
Official title: A Multicenter, Open-Label, Long-Term Extension Study to Evaluate the Long-Term Safety and Tolerability of KT-621 in Participants With Asthma Previously Enrolled in a KT-621 Asthma Study
Run by Kymera Therapeutics, Inc. · NCT07677059 · Data updated 2026-11-12
This phase 2b study tests KT-621 in people with asthma who finished a prior KT-621 study to see if long-term treatment is safe and helpful.
Quick facts
| Phase | Phase 2 |
|---|---|
| Study type | Interventional |
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 264 (estimated) |
| Sponsor | Kymera Therapeutics, Inc. Industry-sponsored |
| Locations | 7 sites (Miami, Florida and 6 other locations) |
| Status | Recruiting |
| Started | June 25, 2026 |
| Main results expected | December 2028 |
| Study ends | December 2028 |
| Registry record updated | October 7, 2026 |
| Trial ID | NCT07677059 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Adults with asthma who completed all visits in the parent KT-621 study and can comply with study procedures.
✕Probably not a fit
Patients who experience adverse events that interrupt safety or who do not tolerate the drug may not benefit.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This open-label extension will follow participants who completed the parent KT-621 asthma study to assess long-term safety and tolerability of KT-621 when given orally. The study also aims to observe sustained efficacy and how the drug behaves in the body over an extended period. Participants will provide regularly scheduled assessments, lab tests, and diary entries to monitor outcomes. No control group is described, and all participants receive KT-621. Locations are limited to Kymera investigative sites in Florida and Texas.
Why it matters
Potential benefit: If successful, participants may experience ongoing asthma symptom control and potentially improved lung function with long-term KT-621 treatment.
How similar studies have gone: Related long-term extension studies of similar targeted protein degrader therapies have shown variable safety and ongoing exploration of efficacy; this design is part of a broader effort to assess long-term outcomes.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * Must have completed all visits of the parent study, per its protocol, up to the end of treatment (EoT) visit. * Must be willing and able to comply with scheduled visits, treatment plan, laboratory tests, other study-related procedures, and questionnaires, including completing the electronic diary (e-diary), for the duration of the study as required by the study protocol. * Must agree to contraceptive requirements in compliance with the clinical study and local requirements. Exclusion Criteria: * Must not have experienced any clinically significant change in health status during the parent study, which, in the opinion of the Investigator, would interfere with participant safety, study evaluations, or compliance with study procedures; or otherwise make the participant unsuitable for participation in this study. * Must not have developed an AE during the parent study, that in the opinion of the Investigator or of the Sponsor's Medical Monitor, could indicate that continued treatment may present an unreasonable risk for the participant. * Must not have met permanent discontinuation criteria and/or permanently discontinued study treatment for any reason during the parent study. * Must not be a member of the Sponsor or site's investigational team or their immediate family. * Must not be unsuitable to enter the study for any other reason, as judged by the Investigator, including potential risk of noncompliance to study procedures.
Where it's running
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Kymera Investigative Site
Miami, Florida, United States Recruiting -
Kymera Investigative Site
Tampa, Florida, United States Recruiting -
Kymera Investigative Site
Dallas, Texas, United States Recruiting -
Kymera Investigative Site
Berlin, Germany Recruiting -
Kymera Investigative Site
Poznan, Poland Recruiting -
Kymera Investigative Site
Kamenitz, Serbia Recruiting
Show 1 more location
-
Kymera Investigative Site
Užice, Serbia Recruiting
Study contacts
- Study coordinator: Kymera Medical Director
- Email: clinicaltrials@kymeratx.com
- Phone: 857-285-5300
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.