Tacrolimus

Biogen has announced that it has initiated a phase 3 study of investigational felzartamab in adults with primary membranous nephropathy (PMN), a severe antibody-mediated kidney disease. The 104-week PROMINENT trial, expected to readout in 2029, will randomise approximately 180 patients with moderate- to -high-risk PMN to receive either felzartamab or tacrolimus. It will enrol both newly diagnosed and relapsed patients, and will compare the efficacy and safety of the two drugs in achieving complete remission of protein in the urine (proteinuria). Approximately 36,000 people in the US are affected by PMN, which carries a significant risk of kidney failure and currently has no specifically approved treatments. The condition is a leading cause of nephrotic syndrome, which often presents with very severe swelling and fatigue related to high-grade proteinuria. Despite treatments ranging from immunosuppressants to chemotherapy, approximately one third of patients do not achieve remission. Felzartamab has already been shown in clinical studies to selectively deplete CD38-positive plasma cells, which Biogen said “may allow applications that ultimately improve clinical outcomes in a broad range of diseases driven by pathogenic antibodies”. Travis Murdoch, head of the Biogen West Coast Hub, said the company is “encouraged by the opportunity to advance a phase 3 study for PMN, a condition that carries a significant risk of kidney failure”. Biogen gained access to felzartamab in July through its $1.8bn acquisition of Human Immunology Biosciences (HI-Bio), which had exclusively licensed the rights to develop and commercialise the asset across all indications in all countries and territories excluding China in 2022. The drug was originally developed by MorphoSys, which Novartis also acquired last year. Beyond PMN, Biogen has recently initiated two phase 3 studies of felzartamab in IgA nephropathy, and kidney transplant recipients who have been diagnosed with late antibody-mediated rejection. Principal investigator for the PROMINENT trial, Mohamed El-Shahawy, said: “Felzartamab’s mechanism of action designed to deplete the cells that produce the pathogenic antibodies is exciting news for patients that are waiting for potential meaningful new treatment options. “I’m grateful that Biogen is advancing research in this rare kidney disease and am eager to see the continued progress in the study’s enrolment.”

CAMBRIDGE, MA, USA I June 30, 2025 I Biogen Inc. (Nasdaq: BIIB) – announced the initiation of dosing in the global clinical study, PROMINENT. The Phase 3 study will evaluate the efficacy and safety of the investigational drug felzartamab compared to tacrolimus in adults diagnosed with primary membranous nephropathy (PMN). PROMINENT is designed to enroll approximately 180 adults with PMN and expected to readout in 2029. PMN is a severe antibody-mediated disease of the kidney that is a leading cause of nephrotic syndrome and carries a significant risk of kidney failure. Felzartamab is an anti-CD38 antibody that has been shown in clinical studies to selectively deplete CD38+ cells, including plasma cells, the source of autoantibodies that mistakenly attack the body’s own tissues in a range of immune-mediated diseases. Importantly for felzartamab, it is estimated that up to 80% of PMN patients have autoantibodies against PLA2R (aPLA2R) generated by CD38-expressing plasma cells. Currently, there are no approved treatments for PMN and the standard of care includes treatments ranging from immunosuppressants to chemotherapy. 2 “We are encouraged by the opportunity to advance a Phase 3 study for primary membranous nephropathy, a condition that carries a significant risk of kidney failure,” said Travis Murdoch, Head of the Biogen West Coast Hub. “This is the third Phase 3 trial of felzartamab launched by Biogen this year, underscoring our ongoing commitment to developing potential novel treatment options for patients living with kidney disease.” PROMINENT is a 104-week, randomized, open-label, global multicenter Phase 3 trial ( NCT06962800 ) to evaluate the efficacy and safety of felzartamab compared with tacrolimus in moderate- to -high-risk participants with PMN, inclusive of newly diagnosed and relapsed patients, in achieving complete remission of proteinuria. Participants will be randomized to receive either felzartamab or tacrolimus with the primary endpoint being the percentage of participants who achieve complete remissions (CR) at week 104. The study will evaluate both anti-PLA2R (aPLA2R) autoantibody positive and negative patients, stratifying participants based on PLA2R levels. Key secondary endpoints include the impact of felzartamab on serum anti-phospholipase A2 receptor (PLA2R) antibodies and patient-reported outcomes. “Primary membranous nephropathy remains an unaddressed area of nephrology, for which there are no approved treatments. Felzartamab’s mechanism of action designed to deplete the cells that produce the pathogenic antibodies is exciting news for patients that are waiting for potential meaningful new treatment options,” said Mohamed El-Shahawy, M.D., MPH, MHA, Director of the Academic Research Institute in Los Angeles, Clinical Professor of Medicine at Keck-University of Southern California School of Medicine, and a principal investigator for the PROMINENT Phase 3 trial. “I’m grateful that Biogen is advancing research in this rare kidney disease and am eager to see the continued progress in the study’s enrollment.” Felzartamab was previously investigated in two Phase 2 studies, M-PLACE (n=31) and NewPLACE (n=24), which enrolled patients with aPLA2R-positive PMN. In the final analysis of M-PLACE , reductions in aPLA2R titers were observed in most patients as early as one week (median reduction of 45%), with responses (>50% reduction) in most patients at six months at end-of-treatment. In addition, improvements in proteinuria and serum albumin levels were observed with administration of felzartamab. Across both studies, the majority of treatment emergent adverse events (TEAEs) reported were mild to moderate and consistent with the known mechanism of action of felzartamab in the PMN population. The most common TEAE was infusion-related reactions on the first infusion that were mostly mild to moderate in intensity. In addition to beginning a Phase 3 study of felzartamab in PMN, Biogen also initiated two other Phase 3 studies of felzartamab this year, TRANSCEND ( NCT06685757 ) for late antibody-mediated rejection in adult kidney transplant recipients and PREVAIL ( NCT06935357 ) in IgA nephropathy. About Felzartamab Felzartamab is an investigational therapeutic human monoclonal antibody directed against CD38, a protein expressed on mature plasma cells. Felzartamab is a potential first-in-class therapeutic candidate with promise as a pipeline-in-a-product across a range of immune-mediated diseases. Felzartamab has been shown in clinical studies to selectively deplete CD38+ plasma cells, which may allow applications that ultimately improve clinical outcomes in a broad range of diseases driven by pathogenic antibodies. Felzartamab was originally developed by MorphoSys AG (now MorphoSys GmbH, a Novartis company). Human Immunology Biosciences (HI-Bio) exclusively licensed the rights to develop and commercialize felzartamab across all indications in all countries and territories excluding China (including Macau and Hong Kong and Taiwan). Biogen acquired HI-Bio in July 2024. Felzartamab is an investigational therapeutic candidate that has not yet been approved by any regulatory authority and its safety and effectiveness have not been established. About Primary Membranous Nephropathy (PMN) PMN is a severe antibody-mediated disease of the kidney that is a leading cause of nephrotic syndrome and carries a significant risk of kidney failure, with an estimated prevalence of ~36k patients in the United States. 1 Patients with nephrotic syndrome often present with very severe swelling and fatigue related to high-grade proteinuria, and they are also at an increased risk of infection. There are no approved treatments for PMN and the current standard of care includes treatments ranging from immunosuppressants to chemotherapy. 2 Even with these strategies, approximately one third of patients do not achieve remission. 2 About Biogen Founded in 1978, Biogen is a leading biotechnology company that pioneers innovative science to deliver new medicines to transform patients’ lives and to create value for shareholders and our communities. We apply deep understanding of human biology and leverage different modalities to advance first-in-class treatments or therapies that deliver superior outcomes. Our approach is to take bold risks, balanced with return on investment to deliver long-term growth. We routinely post information that may be important to investors on our website at www.biogen.com . Follow us on social media – Facebook , LinkedIn , X , YouTube . References: SOURCE : Biogen