This study is researching a particular group of experimental drugs administered for a short period in the treatment of participants with Lupus Nephritis (LN).

The main aim of the current study is to see how safe and tolerable the study drugs are in a long-term follow-up.

This is a main study, called an umbrella study, which includes several independent smaller sub-studies. Each of these smaller main sub-studies tests different drugs at the same time, all aimed at treating LN.

The study is looking at several other research questions, including:

• What side effects may happen from taking the study drug
• How much study drug is in the blood at different times
• Whether the body makes antibodies against the study drug (which could make the drug less effective or could lead to side effects)

Key General Inclusion Criteria:

1. Diagnosis of Systemic Lupus Erythematosus (SLE) and LN, as described in the protocol
2. Participant must have refractory or relapsed disease, as described in the protocol

Key General Exclusion Criteria:

1. History of or active severe or unstable lupus-associated neuropsychiatric disease that is likely to require acute or emergent medical treatment or hospitalization
2. Active overlap syndrome with mixed connective tissue disease or systemic sclerosis within 12 months prior to screening or during screening
3. Catastrophic or severe antiphospholipid syndrome within 12 months prior to screening or during screening

NOTE: Other protocol defined inclusion/exclusion criteria apply

All Individual Patient Data (IPD) that underlie publicly available results will be considered for sharing.

When Regeneron has:

• received marketing authorization from major health authorities (e.g., FDA, European Medicines Agency (EMA), Pharmaceuticals and Medical Devices Agency (PMDA), etc.) for the product and indication or has globally discontinued development of the product for all indications on or after April 2020 and has no plans for future development
• made the study results publicly available (e.g., scientific publication, scientific conference, clinical trial registry)
• the legal authority to share the data, and
• ensured the ability to protect participant privacy

Qualified researchers can submit a proposal for access to individual patient or aggregate level data from a Regeneron-sponsored clinical trial through Vivli. Regeneron's Independent Research Request Evaluation Criteria can be found at: https://www.regeneron.com/sites/default/files/Regeneron-External-Data-Sharing-Policy-and-Independent-Research-Request-Evaluation-Criteria.pdf