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Medi-546

Phase 3

Systemic Lupus Erythematosus | Small molecule | Immunology |AstraZeneca PLC|Last Updated: May 22, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedPLACEBO_CONTROLLED
Total Trials2
Total Enrollment384
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04877691Subcutaneous Anifrolumab in Adult Patients With Systemic Lupus ErythematosusPHASE3 ACTIVE NOT_RECRUITING 367Jun 8, 2021Nov 6, 2026May 22, 2026140 United States, Argentina +13
NCT01559090Safety and Tolerability of Intravenous Dose of MEDI-546 in Japanese Subjects With Systemic Lupus Erythematosus.PHASE2 COMPLETED 17Apr 20, 2012Feb 21, 2017Mar 13, 20196 Japan
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Study Endpoints
Primary Endpoints
British Isles Lupus Assessment Group-based Composite Lupus Assessment (BICLA) response
At week 52

BICLA response is a composite binary endpoint whereby responders are defined by meeting all of the following criteria: * Improvement from baseline in disease activity as measured by BILAG-2004. Improvement is defined as a reduction of all baseline BILAG-2004 A to B/C/D and baseline BILAG-2004 B to C/D and no BILAG-2004 worsening in other organ systems, where worsening is defined as ≥ 1 new BILAG-2004 A or ≥ 2 new BILAG 2004 B. * No worsening from baseline in SLEDAI-2K, where worsening is defined as an increase from baseline of \> 0 points in SLEDAI-2K. * No worsening from baseline in the patient's lupus disease activity, where worsening is defined as an increase ≥ 0.30 points on a 3-point PGA VAS.

Overall Summary of Adverse Events
Stage I (up to 48 weeks)
Secondary Endpoints
Time to first BICLA response sustained through Week 52
Baseline through to Week 52
BICLA response with maintained low (or reduced) use of oral corticosteroid (OCS)
At week 52
Time to flare
Baseline through to Week 52
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Study Design & Arms
AllocationRANDOMIZED
MaskingSINGLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
AnifrolumabEXPERIMENTALSolution for injection in aPFS
PlaceboPLACEBO_COMPARATORSolution for injection in aPFS
1EXPERIMENTALMEDI-546 100 mg IV
2EXPERIMENTALMEDI-546 300 mg IV
3EXPERIMENTALMEDI-546 1000 mg IV
Interventions
NameTypeDescription
Medi-546DRUGPatients will have IP administered or will self-administer IP under supervision by site staff at Week 0 and Week 1 and, for patients participating in the OLE period, at Week 52. For weekly doses coinciding with subsequent on-site visits, patients will also have IP administered or will self-administer IP under supervision by site staff, and in addition will receive a set of kits (including back-up kits) for at-home administration.
PlaceboDRUGSolution for injection in aPFS
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Eligibility Criteria
Age Range18 Years — 70 Years
SexALL
Healthy VolunteersNo
Study Sites140

Inclusion Criteria: 1. Patients who have a diagnosis of pediatric or adult SLE according to the ACR 1997 revised criteria for ≥ 24 weeks prior to signing the ICF 2. To be eligible a patient must have SLEDAI-2K ≥ 6 points and "Clinical" SLEDAI-2K score ≥4 points at screening 3. BILAG2004 with at lea...

Countries:United StatesArgentinaBulgariaChileColombiaGermanyHungaryJapanMexicoPhilippinesPolandSpainThailandUkraineUnited Kingdom
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT04877691primaryCompletionDate: changed
LOWMay 24, 2026NCT04877691studyFirstPostDate: changed