A Phase 2 Study to See if Simtuzumab (GS-6624) is Safe and Works in Idiopathic Pulmonary Fibrosis (IPF)

  • Study type:

    Interventional What is this?

    Describes the nature of a clinical study. Types include:

    • Observational study — observes people and measures outcomes without affecting results.
    • Interventional study (clinical trial) — studies new tests, treatments, drugs, surgical procedures or devices.
    • Medical records research — uses historical information collected from medical records of large groups of people to study how diseases progress and which treatments and surgeries work best.
  • Study phase:

    II What is this?

    During the early phases (phases 1 and 2), researchers assess safety, side effects, optimal dosages and risks/benefits. In the later phase (phase 3), researchers study whether the treatment works better than the current standard therapy. They also compare the safety of the new treatment with that of current treatments. Phase 3 trials include large numbers of people to make sure that the result is valid. There are also less common very early (phase 0) and later (phase 4) phases. Phase 0 trials are small trials that help researchers decide if a new agent should be tested in a phase 1 trial. Phase 4 trials look at long-term safety and effectiveness, after a new treatment has been approved and is on the market.

Study IDs

  • Site IRB:

    • Scottsdale/Phoenix, Arizona: 13-000529
    • Jacksonville, Florida: 13-000529
    • Rochester, Minnesota: 13-000529
  • NCT ID:

  • Sponsor Protocol Number:


About this study

The purpose of this study is to determine if Simtuzumab (GS-6624) is safe and effective in treating Idiopathic Pulmonary Fibrosis.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. If you need assistance understanding the eligibility criteria, please contact the study team.

See eligibility criteria

Inclusion Criteria:

  • Male or female subjects from 45 to 85 years of age
  • Definite IPF within 3 years prior to screening
  • Be able to walk at least 50 meters

Exclusion Criteria:

  • Significant diseases other than IPF
  • Obstructive lung disease
  • Aortic aneurysm greater than or equal to 3.5 cm in diameter
  • Treatment with immunosuppressive, cytotoxic, or antifibrotic drugs < 28 days prior to randomization are not permitted.
    • N-acetylcysteine is permitted provided the individual has been on a stable dose for > 4 weeks prior to screening
    • Concomitant use of pirfenidone or nintedanib must be in accordance with the approved prescribing instructions in the country where the site is located
  • Individuals actively listed for lung transplant are excluded. However individuals at transplant centers with long waiting times (greater than 1 year) may be permitted to enter the study after discussion with Medical Monitor.

Participating Mayo Clinic locations

Study statuses change often. Please contact us for help.

Mayo Clinic Location Status Contact

Scottsdale/Phoenix, Ariz.

Mayo Clinic principal investigator

Augustine Lee, M.D.

Closed for enrollment

Michaele Menghini



Jacksonville, Fla.

Mayo Clinic principal investigator

Augustine Lee, M.D.

Closed for enrollment

Pamela Long CCRP



Rochester, Minn.

Mayo Clinic principal investigator

Augustine Lee, M.D.

Closed for enrollment

Kathleen Mieras