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This study evaluates the drug Povetacicept in people with autoantibody-associated diseases of the kidney's filtering units (glomeruli), including conditions such as IgA nephropathy, membranous nephropathy, and lupus nephritis. It enrolled patients with a biopsy-confirmed diagnosis who had been taking certain medication doses. It is being conducted in Phase 1/Phase 2 and is currently not recruiting but ongoing (active, not recruiting).
The summary above is a plain-language rendering of the official record. The original English title is shown for reference.
Criteria are reproduced from the ClinicalTrials.gov record in the original English. Only the trial team can determine eligibility.
Key Inclusion Criteria Summary:
Part A:
* Biopsy-confirmed autoantibody-associated glomerular disease: immunoglobulin A nephropathy (IgAN), primary membranous nephropathy (pMN), or lupus nephritis (LN)
* On maximal dose or the maximally tolerated dose ACEis/ARBs for ≥12 weeks prior to study Day 1
* Indication-specific criteria:
1. IgAN
* Biopsy-confirmed diagnosis less than or equal to (≤)10 years prior to the start of screening AND Screening UPCR greater than or equal to (≥)0.5 g/g.
* No background immunosuppression therapies.
2. pMN
* A historical biopsy-confirmed diagnosis with positive anti-PLA2R1 antibodies or anti-THSD7A antibodies at screening AND Screening UPCR ≥1 g/g
* Inadequate reduction of proteinuria determined by the Principal Investigator (PI) despite optimal supportive care for at least 12 weeks.
* No background immunosuppression therapies except for optional calcineurin inhibitors.
3. LN
* A Biopsy-confirmed diagnosis of active, proliferative Class III, IV, (with or without Class V) LN ≤6 months prior to the start of screening AND Screening UPCR ≥1 g/g,
* Anti-dsDNA at screening. Anti-dsDNA testing is required but the result need not be positive.
* On stable background immunosuppression ≥ 8 weeks prior to Day 1
4. AAV
* Past diagnosis of renal AAV, defined as either of the following:
* History of renal biopsy consistent with renal AAV.
* History of clinically diagnosed renal AAV.
* Myeloperoxidase (MPO)-ANCA or proteinase 3 (PR3)-ANCA positive by enzyme-linked immunosorbent assay at screening.
* At least 4 weeks since initiation of AAV induction therapy, if applicable.
Part B:
* Participants meet at least 1 of the following criteria:
* Completed investigational product (IP) treatment and 24 weeks of follow-up in Part A, or
* Had IP interruption(s) in Part A, but did not permanently discontinue IP, and completed study visits up to the last scheduled visit of the follow-up period of Part A.
Key Exclusion Criteria Summary:
Part A:
* Prior diagnosis of, or fulfills diagnostic criteria for, another renal disease
* eGFR \<30 milliliter per minute per square meter (mL/min/1.73m\^2) or rapidly progressive glomerulonephritis
* Recent serious or ongoing infection; risk or history of serious infection
* Receipt of B cell depleting therapies or anti-BAFF and/or APRIL therapies within protocol specified timeframes
Part B:
* History of poor compliance with IP and/or procedures in Part A, as deemed by the investigator or Sponsor
* History of any AEs or clinical conditions during Part A or emerging thereafter that may pose a safety concern for participation in Part B as deemed by investigator or Sponsor.
Other protocol defined Inclusion/Exclusion criteria will apply