Pacritinib in Vacuoles, E1 Ubiqutin-activating Enzyme, X-linked, Autoinflammatory, Somatic (VEXAS) Syndrome

The Washington University

Status and phase: Begins enrollment this month; Phase 1

Conditions: E1 Ubiqutin-activating Enzyme, X-linked, Autoinflammatory, Somatic Syndrome; Vexas Syndrome; VEXAS

Treatments: Drug: Pacritinib

Study type: Interventional

Funder types: Other; Industry

Identifiers

NCT06538181

24-x213

Details and patient eligibility

About

VEXAS (vacuoles, E1 ubiqutin-activating enzyme, X-linked, autoinflammatory, somatic syndrome) is a recently described disorder with severe hematologic and rheumatologic manifestations caused by somatic variants in the ubiquitin- activating enzyme gene, UBA1, that is acquired in hematopoietic progenitor cells. Patients are often debilitated by autoinflammatory symptoms and there is currently no standard of care available. There is a clinically unmet need for better therapies in VEXAS Syndrome. There have been no prospective clinical trials of JAK-I in VEXAS syndrome. The investigators hypothesize that pacritinib, as a JAK2/IRAK1 inhibitor with a manageable safety profile in myelofibrosis patients with thrombocytopenia, will improve the autoinflammatory and hematologic manifestations of VEXAS syndrome with a tolerable toxicity profile.

The investigators propose a single arm, pilot Phase 1 study evaluating the safety and tolerability of pacritinib in patients with VEXAS syndrome with an initial safety run-in phase of 6 patients treated with pacritinib 200mg twice daily (BID) on days 1-28 of a continuous 28 day cycle. If no more than 1 patient experiences a dose-limiting toxicity (DLT), the investigators will enroll an expansion cohort to gain additional toxicity and efficacy data, for a total enrollment of 15 patients. If more than 1 patient experiences a DLT during the safety run-in phase, the investigators will decrease the dose to 100 mg BID, and if no more than 1 of 6 patients experiences a DLT, the investigators will complete the expansion cohort as above for up to a total enrollment of 15 patients. If more than 1 patient experiences a DLT at 100 mg BID, the investigators will discontinue the study. Patients will be treated for up to 12 cycles.

Enrollment: 15 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Patients must have UBA1 mutation with a variant allele frequency (VAF) of ≥ 2% detected on a next generation sequencing panel and have at least one of the following current or past clinical manifestation of VEXAS syndrome, as determined by the attending physician:

  • skin rash
  • vasculitis
  • chondritis
  • ocular/orbital inflammation (e.g., uveitis/iritis, episcleritis)
  • genitourinary inflammation (e.g., epididymitis/orchitis)
  • arthritis/arthralgias
  • pulmonary inflammation (e.g., alveolitis/pleural effusion,)
  • fever
  • thrombosis
  • splenomegaly
  • hepatomegaly
  • myocarditis or pericarditis
  • cytopenias (defined as hemoglobin <11 g/dL, platelets < 100 X 10^9 /L, OR absolute neutrophil count <1.0 X 10^9 /L).

• Patients with VEXAS syndrome who have never been treated with a JAK-I will be eligible to enroll on study. A stable corticosteroid dose must be maintained for at least 14 days prior to start of pacritinib.

• Patients who have previously been treated with a JAK-I other than pacritinib, or who are currently being treated with a JAK-I other than pacritinib, may be eligible after a 28 day washout if either (i) their symptoms are not adequately controlled, as determined by the treating physician, or (ii) they have been unable to taper corticosteroids to an equivalent of <10 mg prednisone/day, and in the opinion of the treating physician, may benefit from a change in JAK-I. A stable corticosteroid dose must be maintained for at least 14 days prior to start of pacritinib.

• At least 18 years of age.

• ECOG performance status ≤ 3.

• Organ function as defined below:

  • Total bilirubin ≤ 1.5 x IULN
  • AST(SGOT)/ALT(SGPT) ≤ 3.0 x IULN
  • Creatinine clearance ≥ 30 mL/min by Cockcroft-Gault

• QTcF < 480 msec.

• The effects of pacritinib on the developing human fetus are unknown. For this reason and because pacritinib was shown to be teratogenic in animal studies, women of childbearing potential and men must agree to use adequate contraception prior to study entry, for the duration of study participation, and for 3 months after completion of study treatment. Hormonal contraception is no longer considered highly effective alone as pacritinib is a CYP3A4 inducer and accelerated progesterone metabolism. The contraceptive methods considered highly effective for WOCBP who receive pacritinib are intrauterine devices, vasectomized partner, and sexual abstinence. Hormonal contraceptives (e.g., Depo-Provera) alone are not considered highly effective methods of contraception on their own when in treatment with pacritinib; such hormonal contraceptives should be combined with an additional barrier method (condom, diaphragm with spermicidal gel, or condoms with spermicides to be considered highly effective. Other highly effective contraceptive methods include intrauterine device (IUD), bilateral tubal occlusion, partner vasectomy, or total sexual abstinence. Should a woman become pregnant or suspect she is pregnant while participating in this study, she must inform her treating physician immediately.

• Ability to understand and willingness to sign an IRB approved written informed consent document or that of legally authorized representative, if applicable.

• Patients with myelodysplastic neoplasms (MDS) or plasma cell dyscrasias are eligible if they are not undergoing active treatment. Supportive care is permitted.

Exclusion criteria

• Prior use of pacritinib.
• Use of another JAK inhibitor within 28 days of C1D1 of pacritinib.
• Currently receiving any other investigational agents. Patients may be eligible after 28 day washout.
• Currently receiving immunosuppressants (other than corticosteroids), disease-modifying antirheumatic drugs (DMARDs), or biologic cytokine inhibitors. Patients may be eligible after 28 day washout.
• A history of allergic reactions attributed to compounds of similar chemical or biologic composition to pacritinib.
• Concurrent use of strong CYP3A4 inhibitors or inducers. Patients may be eligible after washout period of 28 days (or 5 half-lives, whichever is shorter).
• Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, or uncontrolled cardiac arrhythmia.
• Pregnant and/or breastfeeding. Women of childbearing potential must have a negative serum pregnancy test within 7 days of C1D1 or negative urine pregnancy test within 3 days of C1D1.
• Known active viral infection with human immunodeficiency virus (HIV), hepatitis B virus (HBV), or hepatitis C virus (HCV).
• Patients with latent tuberculosis. Patients must have a negative T-Spot during screening to be eligible.
• Clinically significant bleeding events within the prior 3 months unless provoked (e.g., due to trauma or surgery).

Trial design

Primary purpose: Treatment

Allocation: Non-Randomized

Interventional model: Sequential Assignment

Masking: None (Open label)

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15 participants in 2 patient groups

Safety Run-in: Pacritinib

Experimental group

Description:

Assigned dose of pacritinib by mouth twice per day. Each cycle is 28 days and participants can receive up to 12 cycles of treatment.

Treatment:

Drug: Pacritinib

Expansion: Pacritinib

Experimental group

Description:

Recommended phase II dose of pacritinib by mouth twice per day. Each cycle is 28 days and participants can receive up to 12 cycles of treatment.

Treatment:

Drug: Pacritinib