The purpose of this study is to evaluate the efficacy and safety of IV antifrolumab in adult patients with Active Proliferative Lupus Nephritis

This Phase 3, multicenter, multinational, randomized, double-blind, placebo-controlled study with OLE is to evaluate the efficacy and safety of anifrolumab versus placebo as added to SOC (MMF and glucocorticoids) in adults with active proliferative Class III or Class IV LN (both with or without concomitant Class V). The total study duration may be up to approximately 142 weeks, including screening and follow-up. Double-blind period will be 76 weeks. Participants who complete double-blind treatment period may enter open-label extension to receive anifrolumab for up 52 weeks. Approximately 360 of the enrolled participants will be randomly assigned to study intervention (anifrolumab or placebo) at a ratio of 1:1 during double-blind treatment period.

Inclusion Criteria:

1. Active proliferative LN Class III or IV either with or without the presence of Class V according to the 2003 ISN/RPS classification
2. Renal biopsy obtained within 6 months prior to signing the ICF or during Screening Period.
3. Urine protein to creatinine ratio > 1 mg/mg (113.17 mg/mmol)
4. eGFR ≥ 35 mL/min/1.73 m2 (as calculated by the Chronic Kidney Disease Epidemiology Collaboration formula).
5. Fulfills updated 2019 EULAR/ACR SLE classification criteria.
6. No signs of symptoms of active TB prior to or during screening or no treatment for latent TB

Exclusion Criteria:

1. A diagnosis of pure Class V LN based on the renal biopsy obtained within 6 months prior to signing the ICF or during Screening.
2. Known history of a primary immunodeficiency, splenectomy, or any underlying condition that predisposes the participant to infection, or a positive result for HIV confirmed by the central lab at Screening - an HIV test must be performed during Screening, and the result should be available prior to Week 0 (Day 1).
3. Evidence of hepatitis C or active hepatitis B.
4. Any history of cancer except sucessfully cured skin squamos or basal skin carcinoma and cervical cancer in situ.
5. Receipt of the following for the current LN flare (ie, since the qualifying renal biopsy): IV cyclophosphamide > 2 pulses of high-dose (≥ 0.5 g/m2) or > 4 doses of low dose (500 mg every 2 weeks) or Average MMF > 2.5 g/day (or > 1800 mg/day of enteric coated mycophenolate sodium) for more than 8 weeks or Tacrolimus > 4 mg/day for more than 8 weeks; Cyclosporine for more than 8 weeks or during last 8 weeks prior to signing the ICF; Voclosporin for more than 8 weeks or during last 8 weeks prior to signing the ICF; Belimumab for more than 12 weeks or during last 12 weeks prior the ICF.
6. Previous receipt of >◦2 investigation treatments (other than anifrolumab) for LN or SLE since time of diagnosis and through the ICF.
7. Known intolerance to ≤ 1.0 g/day of MMF.
8. Any history of severe COVID-19 infection.

Qualified researchers can request access to anonymized individual patient-level data from AstraZeneca group of companies sponsored clinical trials via the request portal. All request will be evaluated as per the AZ disclosure commitment: https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure.

Yes, indicates that AZ are accepting requests for IPD, but this does not mean that all requests will be shared.

AstraZeneca will meet or exceed data availability as per the commitments made to the EFPIA Pharma Data Sharing Principles. For details of our timelines, please rerefer to our disclosure commitment at https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure.

When a request has been approved AstraZeneca will provide access to the de-identified individual patient-level data in an approved sponsored tool. Signed Data Sharing Agreement (non-negotiable contract for data accessors) must be in place before accessing requested information. Additionally, all users will need to accept the terms and conditions of the SAS MSE to gain access. For additional details, please review the Disclosure Statements at https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure.

Double Blind (Participant, Care Provider and Investigator)