Felzartamab Granted Breakthrough Therapy Designation by U.S. Food and Drug Administration (FDA) for Primary Membranous Nephropathy (PMN)
- FDA granted Breakthrough Therapy Designation for felzartamab in PMN upon positive clinical data from M-PLACE, a Phase 2 study led by
I-Mabpartner HI-Bio I-Mabhas full development and commercialization rights of felzartamab in Greater Chinafor all indications, with Phase 3 multiple myeloma data expected in 2024, followed by a planned BLA submission
The FDA selectively grants Breakthrough Therapy Designation to expedite the development and review of drugs that are intended to treat a serious or life-threatening condition, and preliminary clinical evidence indicates the drug may demonstrate substantial improvement over available therapy on a clinically significant endpoint(s).
The designation for felzartamab was based on clinical data submitted to the FDA, including results from M-PLACE, a Phase 1b/2a proof-of-concept, open-label study. The final analysis of the M-PLACE study has been accepted as an oral presentation at the
"We are excited about the potential therapeutic benefit of felzartamab through this Breakthrough Therapy Designation by the FDA, following the Orphan Drug Designation received in May," said Dr.
About Primary Membranous Nephropathy (PMN)
PMN is a rare autoantibody-mediated autoimmune kidney disease and a leading cause of nephrotic syndrome (NS) in adults worldwide. Disease onset and diagnosis typically occurs between 40 and 50 years of age, with 80% of patients presenting with nephrotic syndrome (i.e., edema, >3.5 g/day proteinuria, hypoalbuminemia). PMN is characterized by a thickening of the glomerular basement membrane (GBM) due to the formation and deposition of immune complexes in this space between podocytes and the glomerular endothelium of the kidney.
Approximately 80% of PMN cases arise due to autoantibodies that recognize the phospholipase A2 receptor (PLA2R) antigen expressed on podocytes. Anti-PLA2R is both a diagnostic and prognostic biomarker, and total aPLA2R antibody level has been shown to be a biomarker for prognosis of outcome in patients with PMN. Other autoantibodies have been identified in patients with PMN including anti-THSD7A, NELL-1 and Sema3B, further supporting the role of antibody-secreting plasma cells in the pathophysiology of PMN. CD38+ long-lived plasma cells and plasmablasts are a main source of autoantibodies.
There are no approved therapies for PMN. The current standard of care comprises off-label use of supportive care measures (e.g., angiotensin-converting enzyme inhibitors or angiotensin receptor blockers, statins, and diuretics), conventional immunosuppressive treatments (ISTs) (e.g. cyclophosphamide combined with steroids and calcineurin inhibitors) or B-cell depleting agents (e.g. anti-CD20 antibodies). However, these treatments are not effective in all patients, with a significant proportion of patients not achieving remission or relapsing. In addition, conventional immunosuppressive treatments are associated with a high risk of toxicity.
Felzartamab is an investigational therapeutic human monoclonal antibody directed against CD38, a protein expressed on mature plasma cells. The antibody is directed against CD38 on the surface of multiple myeloma cells, which has been characterized as one of the most strongly and uniformly expressed antigens on the surface of malignant plasma cells. According to its suggested mode of action, the antibody recruits cells of the body's immune system to kill the tumor through antibody-dependent cellular cytotoxicity (ADCC) and antibody-dependent cellular phagocytosis (ADCP). The antibody does not involve complement dependent cytotoxicity, or
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This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and other federal securities laws, including statements regarding data from clinical studies of felzartamab, the potential implications of clinical data for patients, and
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