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Phase 2/3 Study to Evaluate BIIB059 in Active CLE

A 2-Part Seamless Part A (Phase 2)/Part B (Phase 3) Randomized, Double Blind, Placebo-Controlled, Multicenter Study to Evaluate the Efficacy and Safety of BIIB059 in Participants With Active Subacute Cutaneous Lupus Erythematosus and/or Chronic Cutaneous Lupus Erythematosus With or Without Systemic Manifestations and Refractory and/or Intolerant to Antimalarial Therapy (AMETHYST)

Status
Recruiting
Phases
Phase 3
Study type
Interventional
Source
JPRN
Registry ID
JPRN-jRCT2031230262
Enrollment
474
Registered
2023-07-28
Start date
2023-11-29
Completion date
Unknown
Last updated
2026-05-25

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

Conditions

Active SCLE and/or CCLE with or without systemic manifestations and refractory and/or intolerant to

Interventions

Research Name :BIIB059 Generic Name :Litifilimab Trade Names :Not applicable BIIB059 SC Q4W, with an additional dose at Week 2 and Week 26, is proposed for this Phase 2/3 study.

Sponsors

Matsuda Naoto
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: - histologically confirmed (in the past or during the Screening period) diagnosis of CLE with or without systemic manifestations. - Must have active cutaneous manifestations that meet criteria - Must have a CLASI-A score >= 10 - Must have an active CLE lesion despite an adequate trial of antimalarial treatment NOTE: Other protocol defined Inclusion criteria may apply.

Exclusion criteria

Exclusion criteria: - Any active skin conditions other than CLE that may interfere with the study assessments of CLE - Active severe lupus nephritis - Active neuropsychiatric SLE - Use of intralesional corticosteroids within 1 week prior to Screening and during the study - Use of immunosuppressive or disease-modifying treatments for SLE or CLE (via an oral, IV, or SC route) that were initiated less than 12 weeks prior to randomization, have not been at a stable and allowable dose NOTE: Other protocol defined Exclusion criteria may apply.

Design outcomes

Primary

MeasureTime frame
Part A : Proportion of participants who achieve a CLA-IGA-R Erythema score of 0 or 1 at Week 16. Part B (US) : Proportion of participants who achieve a CLA-IGA-R Erythema score of 0 or 1 at Week 16. Part B (ROW) : Proportion of participants who achieve CLASI 70 response, defined as >= 70% decrease in CLASI-A score from Baseline to Week 24.

Secondary

MeasureTime frame
Part A - Proportion of participants who achieve a CLA IGA R Erythema score of 0 or 1 at Week 24. - Proportion of participants who achieve a CLA IGA R OMC score of 0 or 1 and at least 1 level of improvement from Baseline, at Week 16 and Week 24. - Proportion of participants who achieve a CLA IGA-R OMC score of 0, defined as clear skin disease activity at Week 16 and Week 24. - Proportion of participants with at least 1 level of improvement from Baseline in CLA IGA-R OMC score at Week 16 and Week 24. - Proportion of participants who achieve a CLA IGA-R Follicular Activity score of 0 at Week 16 and Week 24. - Proportion of participants who achieve a CLASI 70 response, defined as a >= 70% decrease in CLASI-A score from Baseline at Week 16 and Week 24. - Proportion of participants who achieve a CLASI 50 response, defined as a >= 50% decrease in CLASI-A score from Baseline at Week 16 and Week 24. - Proportion of participants who achieve a CLASI-A score of 0 or 1. - Proportion of participants who achieve a CLASI-A score of 0 to 3. - Proportion of participants who achieve a 70% reduction in CLASI-A. - Proportion of participants who achieve a 50% reduction in CLASI-A. - Proportion of participants who achieve a 7 point reduction from Baseline in CLASI-A score. - Proportion of participants with a CLASI 70 response at Week 52 among CLASI-70 responders1 at Week 16 and Week 24, respectively, who were randomly assigned to receive BIIB059 during the DBPC treatment period. - roportion of participants with a CLA IGA R Erythema score of 0 or 1 at Week 52 among CLA IGA-R Erythema responders1 at Week 16 and Week 24, who were randomly assigned to receive BIIB059 during the DBPC treatment period. - Proportion of participants with a CLA IGA R OMC score of 0 or 1 and at least 1 level of improvement from Baseline at Week 52 among responders1 with a CLA IGA R OMC score of 0 or 1 at Week 16 and Week 24, who were randomly assigned to receive BIIB059 during the DBPC treatment period. - Proport

Countries

Argentina, Belgium, Brazil, Bulgaria, Canada, Chile, China, Colombia, France, Germany, Hungary, Italy, Japan, Mexico, Peru, Philippines, Poland, Portugal, Puerto Rico, Saudi Arabia, Serbia, Slovakia, South Korea, Spain, Sweden, Switzerland, Taiwan, UK, USA

Contacts

Public ContactBiogen Japan Medical Information

Biogen Japan Ltd.

japan-medinfo@biogen.com+81-120-560-086

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: May 30, 2026