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ATI-450 Plus Methotrexate (MTX) Versus Placebo Plus MTX in Patients with Moderate to Severe Active Rheumatoid Arthritis (RA) who have had an Inadequate Response to MTX Alone

A Phase 2b, Randomized, Multicenter, Double-blind, Parallel Group, Placebo Controlled, Dose Ranging Study to Investigate the Efficacy, Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of Multiple Doses of ATI-450 Plus Methotrexate (MTX) Versus Placebo Plus MTX in Patients with Moderate to Severe Active Rheumatoid Arthritis (RA) who have had an Inadequate Response to MTX Alone

Status
Active, not recruiting
Phases
Phase 2
Study type
Interventional
Source
EU CTR
Registry ID
EUCTR2021-002860-31-CZ
Enrollment
240
Registered
2022-02-23
Start date
2022-07-07
Completion date
Unknown
Last updated
2024-03-18

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Patients with Moderate to Severe Active Rheumatoid Arthritis (RA) who have had an Inadequate Response to MTX Alone MedDRA version: 23.1 Level: PT Classification code 10039073 Term: Rheumatoid arthritis System Organ Class: 10028395 - Musculoskeletal and connective tissue disorders

Interventions

Product Name: Zunsemetinib Product Code: ATI-450 Pharmaceutical Form: Tablet INN or Proposed INN: NA CAS Number: 1640282-42-3 Current Sponsor code: ATI-450 Other descriptive name: (P)-3-chloro-4-((3,5

Sponsors

Aclaris Therapeutics, Inc.
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: • Able to comprehend and be willing to sign the Institutional Review Board (IRB)/Independent Ethics Committee (IEC) approved patient ICF prior to administration of any study-related procedures. • Diagnosis of adult-onset RA as defined by the 2010 American College of Rheumatology/European League Against Rheumatism (ACR/EULAR) classification criteria. • Have active moderate to severe RA at Screening. • A minimum of 12 weeks on MTX with a stable MTX dose. Are the trial subjects under 18? no Number of subjects for this age range: F.1.2 Adults (18-64 years) yes F.1.2.1 Number of subjects for this age range 228 F.1.3 Elderly (>=65 years) yes F.1.3.1 Number of subjects for this age range 12

Exclusion criteria

Exclusion criteria: • Current acute or chronic immunoinflammatory disease other than RA which may impact the course or assessment of RA. • Uncontrolled non-immunoinflammatory disease that may place the patient at increased risk during the study or impact the interpretation of results (eg, previous malignancy, recurrent infection, previous venous thromboembolism). • Patient has experience with > 2 biologics, > 1 JAK inhibitor, or a combination of 1 biologic experience and 1 JAK inhibitor. • Currently receiving corticosteroids at doses > 10 mg/day of prednisone (or equivalent) or have been receiving an unstable dosing regimen of corticosteroids within 2 weeks of screening

Design outcomes

Primary

MeasureTime frame
Main Objective: To assess the efficacy of multiple doses of ATI-450 plus MTX versus placebo plus MTX in Patients with moderate to severe active RA;Secondary Objective: 1. To assess the efficacy and safety of ATI-450 plus MTX in patients with moderate to severe active RA. 2. To assess the PK of ATI-450 in patients with moderate to severe active RA who are receiving concomitant MTX. 3. To conduct dose response modeling of ATI-450 in patients with moderate to severe RA who are receiving concomitant MTX. 4. Exploratory: To assess the PD of ATI-450 plus MTX in patients with moderate to severe active RA;Primary end point(s): Proportion of patients achieving ACR20 ;Timepoint(s) of evaluation of this end point: At Week 12

Secondary

MeasureTime frame
Secondary end point(s): • Proportion of patients achieving ACR50/70 at Week 12 • Proportion of patients achieving ACR20/50/70 at each scheduled timepoint • Mean change from baseline in DAS28-CRP over time • Proportion of patients achieving DAS28-CRP remission (score < 2.6) at each scheduled timepoint • Proportion of patients achieving DAS28-CRP low disease activity (score = 3.2) at each scheduled timepoint • Mean change from baseline in CDAI over time • Proportion of patients achieving CDAI remission (score = 2.8) at each scheduled timepoint • Percent change from baseline in hsCRP level each scheduled timepoint • HAQ-DI score over time • SF-36v2 score over time • FACIT-Fatigue score over time • AEs, SAEs, vital signs, laboratory values, PEs, and ECGs • Trough ATI-450 and metabolite (CDD-2164) concentrations at clinic visits. On Day 1, 8, and 85, trough and 2-hour post dose will be collected. • Proportion of patients achieving ACR20/50/70 at Week 12 • Change from baseline to Week 12 in DAS28-CRP;Timepoint(s) of evaluation of this end point: At Week 12

Countries

Bulgaria, Czechia, Czech Republic, Poland, United States

Contacts

Public ContactAjay Aggarwal

Aclaris Therapeutics, Inc.

aaggarwal@aclaristx.com+1484324-7933

Outcome results

None listed

Source: EU CTR (via WHO ICTRP) · Data processed: Feb 4, 2026