NCT06782373 · Swedish Orphan Biovitrum
A Study to Assess the Effectiveness and Safety of Pacritinib in Patients With VEXAS Syndrome (PAXIS)
What this study is about
This study is to assess the effectiveness and safety of pacritinib in patients with VEXAS (i.e., Vacuoles in myeloid progenitors, E1 ubiquitin-activating enzyme, X-linked, autoinflammatory manifestations, and somatic) syndrome. 78 patients will be enrolled, randomly assigned to either pacritinib dose A, pacritinib dose B + placebo, or placebo.
View original scientific description
This study is to assess the effectiveness and safety of pacritinib in patients with VEXAS (i.e., Vacuoles in myeloid progenitors, E1 ubiquitin-activating enzyme, X-linked, autoinflammatory manifestations, and somatic) syndrome. 78 patients will be enrolled, randomized to either pacritinib dose A, pacritinib dose B + placebo, or placebo. Randomization will be stratified by prescribed GC dose on the day of randomization.
Interventions
DRUG
Pacritinib
Supplied in hard capsules.
DRUG
Placebo
Supplied in hard capsules.
Primary outcome measures
Overall Clinical Response (OCR), defined as achieving Clinical Response or better at any time during the double-blind treatment period.
Time frame: up to End of Week 24
Difference in the proportion of participants achieving OCR for the pairwise comparison of pacritinib dose A vs. placebo and pacritinib dose B plus placebo vs. placebo
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Documented evidence of a pathogenic mutation at methionine-41 (M41) or neighboring splice site mutation (c.118-1, c.118-2) position in UBA1 mutation based on myeloid next-generation sequencing (NGS) droplet digital polymerase chain reaction (ddPCR), or Sanger sequencing in peripheral blood or bone marrow samples.
- Current or documented evidence of past involvement within 6 months prior to enrollment of at least one of the following organ systems by VEXAS syndrome: cutaneous (e.g., neutrophilic dermatosis, cutaneous vasculitis), vasculature (e.g., vasculitis), musculoskeletal (e.g., chondritis, arthritis), ocular (e.g., uveitis, scleritis), periorbital (e.g. periorbital edema), genitourinary (e.g., epididymitis), or pulmonary (e.g., alveolitis).
- Receiving ongoing GC therapy (stable prednisone or prednisolone dose of 15-45 mg/day) leading up to enrollment. Note that patients who are stable on GC doses of 10-14 mg/day in addition to another non-GC anti-inflam
Where
- Scottsdale, Arizona
- Boston, Massachusetts
- Rochester, Minnesota
- New York, New York
- Cleveland, Ohio
- Columbus, Ohio
- Houston, Texas
- Salt Lake City, Utah
- Seattle, Washington
Collaborators
PSI CRO
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Apr 24, 2026 · Source of record for eligibility and locations