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The WILLOW study with enpatoran in SLE and CLE (SCLE and/or DLE)

A Phase II, Randomized, Double-Blind, Placebo Controlled Dose-Ranging, Parallel and Adaptive Study to Evaluate the Efficacy and Safety of Enpatoran in Systemic Lupus Erythematosus and in Cutaneous Lupus Erythematosus (Subacute Cutaneous Lupus Erythematosus and/or Discoid Lupus Erythematosus) Participants Receiving Standard of Care

Status
Active, not recruiting
Phases
Phase 2
Study type
Interventional
Source
JPRN
Registry ID
JPRN-jRCT2031210627
Enrollment
18
Registered
2022-02-23
Start date
2022-06-29
Completion date
Unknown
Last updated
2026-06-29

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

Conditions

Systemic Lupus Erythematosus and Cutaneous Lupus Erythematosus

Interventions

The following dosing regimens are proposed to be investigated in Cohort A over a treatment duration of at least 24 weeks: 25, 50 and 100 mg enpatoran twice per day administered orally in a tablet form

Sponsors

Ishii Kyoko
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: Cohort A will have participants with CLE (active SCLE, and/or DLE) (CLASI-A => 8) or SLE with predominantly active lupus rash (CLASI-A => 8) Cohort B will have SLE participants who have moderate to high systemic disease activity (BILAG => 1A and/or 2B) with 1 or 2 of the following: CLASI A => 8 and/or SLEDAI => 6.

Exclusion criteria

Exclusion criteria: 1. Primary diagnosis of autoimmune or rheumatic disease other than SLE or CLE (discuss with Medical Monitor if overlap syndrome). Note: Secondary Sjogren's syndrome or an autoimmune thyroiditis are not exclusionary. 2. Drug-induced lupus (SLE or CLE). 3. Any condition including dermatological diseases other than cutaneous manifestations of SLE or CLE (e.g., psoriasis), or any uncontrolled disease (e.g., asthma, interstitial lung disease, pulmonary arterial hypertension, morbid obesity), that in Investigator's or Sponsor/designee's opinion constitutes inappropriate risk or contraindication for participation.

Design outcomes

Primary

MeasureTime frame
To evaluate the dose-response relationship of enpatoran in reducing disease activity based on CLASI-A To evaluate the dose-response relationship of enpatoran in reducing disease activity based on BICLA response rate

Countries

Argentina, Australia, Brazil, Bulgaria, Canada, Chile, China, Colombia, Greece, Israel, Japan, Mauritius, Mexico, Moldova, Philippines, Poland, Puerto Rico, Russia, Serbia, South Africa, Spain, Sweden, Ukrine, United States

Contacts

Public ContactClinical Trial Information Contact

Merck Biopharma Co., Ltd.

MBJ_clinicaltrial_information@merckgroup.com+81-3-6756-0800

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026