Clinical trial Recruiting at 28 sites Phase 2 Interventional Ages 12 and up

Evaluating CSL889 for treating vaso-occlusive crises in sickle cell disease

Official title: A Phase 2, Multicenter, Randomized, Multiple-Dose, Double-Blind, Placebo-Controlled Study to Evaluate the Safety, Efficacy, and Pharmacokinetics of CSL889 in Adults and Adolescents With Sickle Cell Disease During Vaso-Occlusive Crisis

Run by CSL Behring · NCT06699849 · Data updated 2026-11-12

This study is testing a new treatment called CSL889 to see if it can help adults and teens with sickle cell disease who are having painful vaso-occlusive crises feel better.

Quick facts

PhasePhase 2
Study typeInterventional
Ages12 Years and up
SexAll
Enrollment70 (estimated)
SponsorCSL Behring
Industry-sponsored
Locations30 sites (Oakland, California and 29 other locations)
StatusRecruiting
StartedJuly 10, 2025
Main results expectedOctober 22, 2027
Study endsOctober 22, 2027
Registry record updatedOctober 8, 2026
Trial IDNCT06699849 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates for this study are adults and adolescents aged 12 and older diagnosed with sickle cell disease who are experiencing a new acute vaso-occlusive crisis.

Probably not a fit

Patients who have had a history of more than five vaso-occlusive crises requiring hospitalization in the past six months or those with acute kidney injury may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical trial is designed to assess the safety, efficacy, and pharmacokinetics of CSL889, a human hemopexin, administered intravenously to adults and adolescents with sickle cell disease experiencing vaso-occlusive crises. The study consists of two parts: a phase 2 component focusing on initial safety and efficacy, followed by a phase 3 component to further evaluate these aspects in a larger population. Participants will be monitored for the resolution time of vaso-occlusive crises and the overall tolerability of the treatment. The trial aims to provide valuable insights into a potential new therapeutic option for managing this painful condition.

Why it matters

Potential benefit: If successful, this treatment could significantly reduce the duration and severity of vaso-occlusive crises in patients with sickle cell disease.

How similar studies have gone: While this approach is novel in the context of CSL889, similar studies targeting vaso-occlusive crises in sickle cell disease have shown promise with other interventions.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* At the time of informed consent:

  * 18 years of age (adults); or
  * 12 to less than (\<) 18 years of age (adolescents, where approved and when enrollment for adolescents has been opened by the sponsor, with the endorsement of the Independent Data Monitoring Committee \[IDMC\])
* Diagnosed with SCD (any genotype).
* Presented at the study site with a new acute VOC necessitating treatment with parenteral opioids.

Exclusion Criteria:

* VOC pain onset greater than (\>) 72 hours before administration of first parenteral opioid.
* Must not have a history of \> 5 VOCs requiring hospital admission in the past 6 months; or signs and / or symptoms of ACS; or new neurological symptoms suggestive of acute stroke or transient ischemic attack; or any stage (acute kidney injury) AKI; or been discharged from inpatient hospital admission for VOC or other vaso-occlusive event within 14 days before the current presentation.
* Serum hemoglobin \< 6 g/dL, serum ferritin ≥ 2000 ng/mL, receiving an approved medication for SCD that has not been on a stable, well-tolerated regimen, currently taking methadone or buprenorphine.

Where it's running

  • Univ. of California, San Francisco Health Care
    Oakland, California, United States
    Recruiting
  • University of California Irvine
    Orange, California, United States
    Recruiting
  • Medstar Washington Hospital Center
    Washington D.C., District of Columbia, United States
    Recruiting
  • Golisano Children's Hospital
    Fort Myers, Florida, United States
    Recruiting
  • The Foundation for Sickle Cell Disease
    Hollywood, Florida, United States
    Recruiting
  • Arthur M. Blank Hospital-Children's Healthcare of Atlanta
    Atlanta, Georgia, United States
    Recruiting
Show 24 more locations
  • University of Illinois at Chicago
    Chicago, Illinois, United States
    Recruiting
  • University of Louisville Hospital
    Louisville, Kentucky, United States
    Recruiting
  • University of Maryland
    Baltimore, Maryland, United States
    Recruiting
  • Detroit Medical Center
    Detroit, Michigan, United States
    Recruiting
  • Henry Ford Health System
    Detroit, Michigan, United States
    Recruiting
  • St. Louis Children's Hospital
    St Louis, Missouri, United States
    Recruiting
  • Mount Sinai Medical Center
    New York, New York, United States
    Recruiting
  • Jacobi Medical Center
    The Bronx, New York, United States
    Recruiting
  • East Carolina University
    Greenville, North Carolina, United States
    Recruiting
  • University of Cincinnati
    Cincinnati, Ohio, United States
    Recruiting
  • The Ohio State University
    Columbus, Ohio, United States
    Recruiting
  • University of Pittsburgh
    Pittsburgh, Pennsylvania, United States
    Recruiting
  • Hillman Cancer Center
    Pittsburgh, Pennsylvania, United States
    Recruiting
  • Baskent University School of Medicine
    Adana, Turkey (Türkiye)
    Recruiting
  • Hacettepe Universitesi
    Ankara, Turkey (Türkiye)
    Recruiting
  • Medical Park Mersin Hospital
    Mezitli-Mersin, Turkey (Türkiye)
    Recruiting
  • Özel Acibadem Adana Hastanesi
    Seyhan, Turkey (Türkiye)
    Recruiting
  • Özel Acibadem Adana Hastanesi
    Seyhan/Adana, Turkey (Türkiye)
    Recruiting
  • Mersin Universitesi
    Yenişehir, Turkey (Türkiye)
    Recruiting
  • Royal Liverpool University Hospital
    Liverpool, United Kingdom
    Recruiting
  • University College London Hospitals NHS Trust
    London, United Kingdom
    Recruiting
  • Guy's Hospital
    London, United Kingdom
    Recruiting
  • Virginia Commonwealth University
    Richmond, Virginia, United States
    Withdrawn
  • Istanbul Universitesi
    Istanbul, Turkey (Türkiye)
    Not yet recruiting

Study contacts

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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.
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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.