Does telitacicept help reduce proteinuria in adults with IgA nephropathy?
Telitacicept is a medication that targets two immune proteins (BAFF and APRIL) involved in IgA nephropathy. Several studies show it can lower proteinuria (protein in urine), a key marker of kidney damage. The strongest evidence comes from a large Phase 3 trial, with additional support from real-world studies.
What the research says
A Phase 3 trial randomly assigned 318 adults with IgA nephropathy to receive telitacicept (240 mg weekly) or placebo. At 39 weeks, the telitacicept group had a 58.9% reduction in proteinuria, compared to only 8.8% in the placebo group — a relative difference of 55% in favor of telitacicept 1. This result was highly statistically significant (P<0.001).
Real-world studies confirm these findings. A multicenter study of 97 patients found significant proteinuria reductions at 2, 4, and 6 months of treatment 7. Another study of 11 high-risk patients reported a 64.4% reduction in proteinuria at 24 weeks, with 90.9% of patients responding to treatment 8. A larger study of 256 patients showed that combining telitacicept with glucocorticoids and mycophenolate mofetil led to even greater proteinuria reduction than telitacicept alone 9.
Importantly, telitacicept appears to preserve kidney function. In the Phase 3 trial, estimated glomerular filtration rate (eGFR) remained stable 1. Real-world studies also showed stable or improved eGFR over follow-up 78. The safety profile is generally favorable, with mild injection-site reactions being the most common side effect 8.
What to ask your doctor
- Is telitacicept an option for me given my current proteinuria level and kidney function?
- What are the potential benefits and risks of telitacicept compared to other treatments like SGLT2 inhibitors or immunosuppressants?
- How long would I need to take telitacicept to see a meaningful reduction in proteinuria?
- Are there any specific monitoring requirements (e.g., blood tests, urine tests) while on telitacicept?
- Would combining telitacicept with other medications like steroids or mycophenolate mofetil be more effective for my case?
This question is drawn from common patient questions about Nephrology and answered using cited medical research. We do not provide individualized advice.