Clinical trial Recruiting at 7 sites Phase 2 Interventional Ages 18 and up

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.

More Asthma (Diagnosis) trials

Quick facts

PhasePhase 2
Study typeInterventional
Ages18 Years and up
SexAll
Enrollment264 (estimated)
SponsorKymera Therapeutics, Inc.
Industry-sponsored
Locations7 sites (Miami, Florida and 6 other locations)
StatusRecruiting
StartedJune 25, 2026
Main results expectedDecember 2028
Study endsDecember 2028
Registry record updatedOctober 7, 2026
Trial IDNCT07677059 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

  • 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

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.