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Telitacicept for IgA Nephropathy - Interim Analysis of a Phase 3 Trial. BACKGROUND: The pathogenesis of IgA nephropathy is mediated by B-cell activating factor (BAFF) and a proliferation-inducing ligand (APRIL). Telitacicept is a fusion protein that targets and neutralizes both BAFF and APRIL and, as such, might be effective in IgA nephropathy. METHODS: We now report a prespecified interim analysis of a phase 3, multicenter, double-blind, randomized, placebo-controlled trial, which enrolled adults with biopsy-proven IgA nephropathy and persistent proteinuria (protein level, ≥1.0 g per day), despite appropriate supportive care. Patients were randomly assigned in a 1:1 ratio to receive subcutaneous once-weekly telitacicept (240 mg) or matching placebo. The primary end point was the geometric mean ratio of the 24-hour urinary protein-to-creatinine ratio at 39 weeks relative to baseline. Safety was also evaluated. RESULTS: A total of 318 patients were assigned to receive telitacicept or placebo (159 in each group). At week 39, the percentage change in the 24-hour urinary protein-to-creatinine ratio was -58.9% with telitacicept and -8.8% with placebo, which corresponded to a relative difference (based on the ratio of geometric mean reductions between the two groups) of -55.0% (95% confidence interval [CI], -61.3 to -47.6; P<0.001) in favor of active medication. The percentage change in the estimated glomerular filtration rate relative to baseline was -1.0% (95% CI, -3.2 to 1.2) with telitacicept and -7.7% (95% CI, -9.9 to -5.4) with placebo. Adverse events were more common with telitacicept than with placebo (in 89.3% vs. 78.6% of patients), although serious adverse events were less common (in 2.5% vs. 8.2%). No unexpected safety findings were reported with telitacicept. CONCLUSIONS: In patients with IgA nephropathy at high risk for progression, 39 weeks of treatment with telitacicept led to a greater reduction in the 24-hour urinary protein-to-creatinine ratio than placebo. (Funded by RemeGen; TELIGAN ClinicalTrials.gov number, NCT05799287.).