Phase 2, Multicenter, Randomized, Open-label, Controlled, 2-arm Cross-over Study to Evaluate the Clinical Efficacy of a Renin Inhibitor, Aliskiren, Compared to an Angiotensin Converting Enzyme Inhibitor, Enalapril, in C3 Glomerulopathy
试验速览
- 阶段
- 2 期
- 状态
- 招募中
- 发起方
- Region Skane
- 入组人数
- 30
- 试验地点
- 4
- 主要终点
- Complement deposition in kidneys
研究概览
简要总结
The aim of this cross-over trial is to assess aliskiren, a direct renin inhibitor, as a novel treatment to block complement activation in the kidneys and thereby attenuate renal disease and stabilize or improve kidney function and compare it to the currently used treatment with the angiotensin converting enzyme inhibitor, enalapril, in patients with the complement-mediated renal disease C3 glomerulopathy. Patients will be randomized to one or the other treatment for the first 6 months and then switch to the other treament for the following 2.5 years. Treatment will continue for altogether 3 years for each patient.
详细描述
The primary objective is to assess the effect and safety of aliskiren on reducing systemic and local complement activation as indicated by a reduction of serum C3 during the cross-over study and serum C3 and complement deposition in renal biopsies during the extension study in patients with C3 glomerulopathy as compared to the currently used treatment with the angiotensin converting enzyme inhibitor (ACEi) enalapril.
Secondary objectives are to assess the effect of aliskiren as compared to the currently used treatment with the ACEi enalapril on: complement activation (such as serum C3a, C3dg, C5a and related complement assays), proteinuria, kidney function, kidney biopsy findings, blood pressure, activation of the renin angiotensin system.
Aliskiren will be administered orally in tablet form at 150 -300 mg/daily (maximal dose 300 mg). Enalapril 2.5-20 mg/daily (maximal dose 20 mg). These drugs may be administered once or twice.
The investigators estimate an inclusion of maximum 15 patients for start of treatment with aliskiren and maximum 15 patients for start of treatment with enalapril. Suitable patients will be chosen from those patients who:
- Do not have severe renal failure. Pediatric patients will be included if they have a glomerular filtration rate ≥ 50 ml/min/1.73m2, adults ≥ 30 ml/min/1.73m2.
- Children, above the age of 6 years of age and adults.
- Patients treated with aliskiren will be compared to patients treated with the ACE inhibitor enalapril as monotherapy. Use of ACE inhibitor as a nephroprotective therapy will increase renin levels without blocking its effect. Thus, the investigators will compare patients on aliskiren with those on enalapril to investigate if ACE inhibition as monotherapy has a negative effect on complement activation in comparison to direct renin inhibition.
- Patients treated with immune suppressive medications at the start (such as mycophenolate mofetil (MMF) or corticosteroids) will be compared to patients treated with MMF or steroids plus aliskiren or enalapril.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 6 Years 至 —（Child, Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Children ≥ 6 years and adults.
- •Initial diagnosis of Dense Deposit Disease and C3 glomerulonephritis confirmed by kidney biopsy obtained not more than 2 years before the first dose of the study drug.
- •Either absence of treatment at the study start or ongoing treatment with aliskiren, angiotensin converting enzyme inhibitors, angiotensin receptor blockers or immune suppressive medications (such as mycophenolate mofetil/MMF or corticosteroids)
- •Written informed consent has been given by:
- •the patient's legal guardians if the patient is less than 15 years old
- •the patient and his/her legal guardians if the patient is ≥ 15 but < 18 years old
- •the patient, if the patient is ≥ 18 years old
- •Female subjects of childbearing potential must:
- •Understand that the study medication is expected to have a teratogenic risk
- •Agree to use a highly effective contraceptive during study drug therapy. This applies unless the subject is less than 18 years of age, has not had sexual debut and commits to sexual abstinence confirmed by a pregnancy test on every study visit. Either of the following methods of contraception may be used:
- •Combined (estrogen and progesterone) hormonal contraception associated with inhibition of ovulation: oral, intravaginal or transdermal
- •Progestogen-only hormonal contraception associated with inhibition of ovulation: oral, injectable or implantable
- •Intrauterine device
- •Intrauterine hormone-releasing system
- •Bilateral tubal occlusion
- •Vasectomized partner
- •Sexual abstinence
- •Male or female condom with or without spermicide
- •Cap, diaphragm or sponge with spermicide
- •Agree to have a pregnancy test before the start of study medication. This requirement also applies to women of childbearing age who practice complete and continued abstinence and adolescent girls after menarche.
- •Agree to have a pregnancy test every 3rd month including at the end of study treatment, except in the case of confirmed tubal sterilization. This requirement also applies to women of childbearing age who practice complete and continued abstinence and adolescent girls after menarche.
排除标准
- •Known allergy to aliskiren, ACEi or substances contained in these preparations.
- •Angioedema caused by aliskiren or enalapril
- •Weight < 25 kg
- •Glomerular filtration rate ≤ 50 ml/min/1.73 m2 (measured by iohexol clearance) in children and ≤ 30 ml/min/1.73 m2 in adults.
- •Rapid deterioration of kidney function during the latest year of the disease
- •Patients with a renal transplant
- •Immune complex-mediated membranoproliferative glomerulonephritis (such as in HIV infection, hepatitis, SLE)
- •Females who breastfeed, are pregnant or planning to become pregnant during the study.
- •Co-morbidity such as malignancy, congestive heart failure, recent myocardial infarction.
- •Mental incapacity or language barriers to understand the contents of the study design.
- •Simultaneous use of another complement-antagonist (such as eculizumab). Eculizumab must be discontinued and complement activity normalized before the start of study drug.
- •Simultaneous use of aliskiren or enalapril with cyclosporine or nonsteroidal anti-inflammatory drugs (NSAID).
研究组 & 干预措施
Aliskiren treatment
Patients will be randomized to tablet treatment with aliskiren (target daily dose) 150-300 mg once daily or every other day (depending on weight) for 6 months. After 6 months the patients will be switched to tablet treatment with enalapril (target daily dose 7.5-20 mg once or twice a day) for the coming 2,5 years.
干预措施: Aliskiren (Drug)
Enalapril treatment
Patients will be randomized to tablet treatment with enalapril (target daily dose 7.5-20 mg once or twice a day) for 6 months. After 6 months the patients will be switched to tablet treatment with aliskiren (target daily dose) 150-300 mg once daily or every other day (depending on weight) for the coming 2,5 years.
干预措施: Enalapril (Drug)
结局指标
主要结局
Complement deposition in kidneys
时间窗: 3 years
To quantify complement deposition in kidney biopsies from patients with C3 glomerulopathy using immunohistological staining
C3 levels in serum
时间窗: 3 years
To assess the effect and safety of aliskiren as compared to enalapril on reducing systemic complement activation as assayed by C3 levels in serum.
次要结局
- C3a in serum(3 years)
- C3dg in plasma(3 years)
- C5a in serum(3 years)
- Glomerular basement membrane thickness(3 years)
- Proteinuria(3 years)