Phase 2 Study of Budoprutug TNT119 Given by IV to Adults With Primary Membranous Nephropathy to Assess Safety and Effectiveness

What this Trial Is About

Researchers are evaluating the safety and tolerability of three different dose regimens of budoprutug in adults with primary membranous nephropathy PMN who test positive for anti-PLA2R antibodies and continue to have proteinuria despite optimized RAAS inhibition. This Phase 2, open-label, multicenter study aims to assess the safety, pharmacodynamics, and early effectiveness of budoprutug, a humanized monoclonal antibody that targets CD19 to deplete specific cells through antibody-dependent cellular cytotoxicity. Participants will receive a single intravenous dose of budoprutug on Days 1, 15, 169, and 183 across three sequential dose groups. Approximately 45 subjects will be enrolled and treated with one of the three dose levels. The study includes an initial dosing period followed by extended follow-up to monitor B-cell recovery and other effects up to Week 48. During the study, participants will be closely monitored for adverse events and changes in various laboratory measures, including B cell counts, anti-PLA2R antibody levels, proteinuria, and kidney function. Researchers will evaluate safety outcomes up to Week 48 and assess pharmacokinetics such as plasma concentration and clearance. Follow-up visits will track participant health, treatment effects, and recovery over the course of the study.

A Phase 2 Study of Budoprutug in Subjects With Primary Membranous Nephropathy