for people ages 18-75 (full criteria)
at Torrance, California and other locations
study started
completion around
Principal Investigator
by George Karpouzas



The purpose of this Proof of Concept (PoC) and Dose-finding (DF) basket study is to evaluate the efficacy and safety of orally administered Enpatoran over 24 weeks in systemic lupus erythematosus (SLE) and cutaneous lupus erythematosus (CLE; subacute cutaneous lupus erythematosus [SCLE] and/or discoid lupus erythematosus [DLE]) participants in a randomized, double-blind, placebo-controlled, parallel, adaptive and dose-ranging setting. Study Duration: 33 weeks Visit Frequency: every 2 or 4 weeks Enpatoran is not available through an expanded access program.

Official Title

A Phase II, Randomized, Double-Blind, Placebo-Controlled Dose-Ranging, Parallel and Adaptive Study to Evaluate the Efficacy and Safety of Enpatoran in SLE and in CLE (SCLE and/or DLE) Participants Receiving Standard of Care (WILLOW)


Systemic Lupus Erythematosus, Toll-like Receptor 7, Toll-like Receptor 8, WILLOW, Adults, SLE, CLE, Lupus, Discoid lupus erythematosus, Subacute cutaneous lupus erythematosus, M5049, Enpatoran, Enpatoran low dose, Enpatoran medium dose, Enpatoran high dose


You can join if…

Open to people ages 18-75

  • Active CLE (SCLE and/or DLE) with a CLE disease area and activity index (CLASI-A) >= 8
  • Active SLE with presence of: CLASI-A >= 8 and BILAG 2004 1B, C, D (that is [i.e.], No BILAG 2004 A and No BILAG 2004 >= 2B) or BILAG 2004 >= 1A or 2B and 1 or 2 of the following: Hybrid Safety of Estrogens in Systemic Lupus Erythematosus National Assessment (SELENA)-SLEDAI >= 6 at Screening Visit and confirmed clinical hybrid SELENA-SLEDAI >= 4 (excluding laboratory parameters) at Day 1 Visit and/or CLASI-A >= 8
  • Receiving a stable dose of at least one of the following standards of care therapies for lupus: Immunomodulator/immunosuppressant, oral corticosteroids, and/or topical corticosteroids
  • Other protocol defined inclusion criteria could apply

You CAN'T join if...

  • Autoimmune or rheumatic disease other than SLE or CLE
  • Dermatological diseases other than cutaneous manifestations of SLE or CLE
  • Uncontrolled medical conditions including significant cardiovascular events, active lupus nephritis, and active neurological disorder
  • Ongoing or active clinically significant viral, bacterial, or fungal infection
  • History of uncontrolled seizures or other neurological disorder
  • History of or positive for human immunodeficiency virus, hepatitis C virus, or hepatitis B virus
  • History of malignancy
  • Other protocol defined exclusion criteria could apply


  • The Lundquist Institute at Harbor-UCLA Medical Center accepting new patients
    Torrance California 90509 United States
  • Centro Medico del Angel accepting new patients
    Mexicali Mexico

Lead Scientist at UCLA


accepting new patients
Start Date
Completion Date
EMD Serono Research & Development Institute, Inc.
Trial Awareness and Transparency website
Phase 2 Lupus Research Study
Study Type
Expecting 532 study participants
Last Updated