Throughout the treatment period and for up to one year of additional follow up off treatment, blisibimod appeared to halt disease progression as measured by the mean estimate of 24-hour urinary protein excretion levels, also known as proteinuria. Specifically, in patients treated with blisibimod, the mean change in proteinuria was stable to trending slightly downward, whereas the mean levels increased for patients in the placebo arm.
Estimated 24 Hour Urine Protein Excretion
|Blisibimod - mean (grams)||2.02||2.17||1.86||1.86||1.88||2.12||2.19||1.18|
|Placebo - mean (grams)||2.26||2.16||2.01||2.42||2.89||3.35||3.22||4.68|
Additionally, blisibimod demonstrated a trend toward preservation of renal function based upon individual rates of change in estimated glomerular filtration rate (eGFR), with an annualized improvement of +6.2mL/min/1.73 m2 per year compared to a worsening of -4.8 mL/min/1.73 m2 of body surface area with placebo.
As seen with previous interim analyses of the BRIGHT data, serum immunoglobulins IgA, IgG, and IgM, continue to demonstrate marked reduction throughout the treatment period.
Blisibimod was well tolerated with substantially more patients on the placebo arm discontinuing from the study than those receiving blisibimod. The most common adverse events seen in the blisibimod group over the entire study period were upper respiratory infection, nasopharyngitis, and injection site reactions. There were no incidences of serious infection in the blisibimod group and the overall rates of infection were similar in the two treatment groups.
"We are very pleased with the final extension data and believe that the recent findings, as well as the orphan designation granted by the
"It is good to see that the interim observations, that blisibimod may slow the worsening of proteinuria, persisted through the end of the study. The new observations showing long-term trends in preservation of glomerular filtration are exciting as these are goals for all IgAN therapies," said Professor
Fifty-eight (58) patients aged 18-65 with historical kidney biopsy proven IgAN (Oxford classification), persistent proteinuria (1-6 g/24hrs) despite treatment with angiotensin converting enzyme inhibitors (ACEi) and/or angiotensin receptor blockers (ARB), and estimated glomerular filtration rate > 30mL/min/1.73m2 were equally randomized to receive either blisibimod (300mg/wk for 8 weeks and 200mg/wk thereafter; n=30) or matching placebo (n=28) for at least 24 weeks. Patients with advanced glomerular or tubulointerstitial scarring or rapidly progressive glomerulonephritis were excluded. After Week 24, patients were given the opportunity to receive blinded treatment for up to 104 weeks, discontinue treatment but continue to be followed, or discontinue from the study. Fifty-seven (57) patients received at least one dose of study medication and were included in the efficacy (mITT) and safety evaluations. The study was ended when all ongoing patients had completed at least Week 60. Forty seven patients (27 blisibimod, 20 placebo) completed at least 24 weeks of evaluation, 43 completed at least 60 weeks of evaluation, and 22 completed assessments through at least 108 weeks.
The study population was balanced between treatment groups with respect to age, weight, BMI, demographic and disease characteristics. Patients were enrolled from
All patients were treated with an optimal, stable dose of ACEi and/or ARB for a minimum of 90 days prior to randomization and this therapy was continued throughout the trial as background medication. Patients were not allowed to receive corticosteroids for the treatment of IgA nephropathy within 3 months or immunosuppressives within 6 months of screening; however, these medications could be initiated as rescue treatment after randomization.
The BRIGHT-SC study was originally designed as a two-part Phase 2/3 study with a target enrollment of 200 patients. Part A was a 24-Week study of the effects of blisibimod on proteinuria, and Part B was an extension phase in which long term effects on the prevention of end stage renal disease would be assessed. The primary endpoint of the study was the number of patients who achieved a partial or complete response in urinary protein excretion at Week 24. A partial response was defined as achieving proteinuria ≤1g/24hrs, and a complete response as follows: for patients with baseline proteinuria ≥1g/24hrs but ≤2g/24hrs, achievement of proteinuria ≤1.0g/24hr AND a 50% reduction from baseline at 2 consecutive visits; for patients with baseline proteinuria > 2g/24hrs, achievement of proteinuria ≤1.0g/24hr OR a 50% reduction from baseline at 2 consecutive visits. Due to slow recruitment, enrollment was curtailed at 58 patients and the study was converted to a Phase 2 study. An observed case, interim analysis was conducted when all patients had the opportunity to complete Week 24 and another at Week 48, results of which were previously announced. Mean effects by treatment group on proteinuria and certain measures of expected pharmacology (circulating B cells and B cell subpopulations, serum immunoglobulins) were analyzed and reported to Anthera by an independent statistician, with the treatment blind maintained for the patient, investigator, and sponsor personnel.
About IgA Nephropathy
IgA nephropathy (IgAN, also known as Berger's disease) is the most common cause of primary glomerulonephritis worldwide, occurring more frequently in
Blisibimod is a selective peptibody antagonist of the B-cell activating factor (BAFF) cytokine. BAFF is a tumor necrosis family member and is critical to the development, maintenance and survival of B-cells. It is primarily expressed by macrophages, monocytes and dendritic cells and interacts with three different receptors on B-cells: BAFF receptor, or BAFF-R; B-cell maturation antigen, or BCMA; and transmembrane activator and cyclophilin ligand interactor, or TACI. BAFF-R is expressed primarily on peripheral B-cells. Blisibimod consists of a novel BAFF binding domain fused to the N-terminus of the Fc region of human IgG1 antibody. Blisibimod binds to both membrane and soluble BAFF, and inhibits the interaction of BAFF with its receptors.
Safe Harbor Statement
Any statements contained in this press release that refer to future events or other non-historical matters, including statements that are preceded by, followed by, or that include such words as "estimate," "intend," "anticipate," "believe," "plan," "goal," "expect," "project," or similar statements, are forward-looking statements made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are based on Anthera's expectations as
of the date of this press release and are subject to certain risks and uncertainties that could cause actual results to differ materially as set forth in Anthera's public filings with the
CONTACT: Investor Relations of
For Media Inquiries:
News Provided by Acquire Media