Experience with levamisole in frequently relapsing, steroid-dependent nephrotic syndrome

Non-corticosteroid immunosuppressive medications for steroid-sensitive nephrotic syndrome in children

BACKGROUND

About 80% of children with steroid-sensitive nephrotic syndrome (SSNS) have relapses. Of these children, half will relapse frequently, and are at risk of adverse effects from corticosteroids. While non-corticosteroid immunosuppressive medications prolong periods of remission, they have significant potential adverse effects. Currently, there is no consensus about the most appropriate second-line agent in children with frequently relapsing SSNS. In addition, these medications could be used with corticosteroids in the initial episode of SSNS to prolong the period of remission. This is the fifth update of a review first published in 2001 and updated in 2005, 2008, 2013 and 2020.

OBJECTIVES

To evaluate the benefits and harms of non-corticosteroid immunosuppressive medications in SSNS in children with a relapsing course of SSNS and in children with their first episode of nephrotic syndrome.

SEARCH METHODS

We searched the Cochrane Kidney and Transplant Register of Studies up to October 2024 through contact with the Information Specialist using search terms relevant to this review. Studies in the Register are identified through searches of CENTRAL, MEDLINE, and EMBASE, conference proceedings, the International Clinical Trials Registry Platform (ICTRP) Search Portal and ClinicalTrials.gov.

SELECTION CRITERIA

Randomised controlled trials (RCTs) or quasi-RCTs were included if they involved children with SSNS and compared non-corticosteroid immunosuppressive medications with placebo, corticosteroids or no treatment; different non-corticosteroid immunosuppressive medications, or different doses, durations or routes of administration of the same non-corticosteroid immunosuppressive medication.

DATA COLLECTION AND ANALYSIS

Two authors independently assessed study eligibility, risk of bias and extracted data from the included studies. Statistical analyses were performed using a random-effects model and results expressed as risk ratio (RR) for dichotomous outcomes or mean difference (MD) for continuous outcomes with 95% confidence intervals (CI). Confidence in the evidence was assessed using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach.

MAIN RESULTS

We identified 58 studies (122 reports) randomising 3720 children. Half were multicentre studies, and most studies were undertaken in South and East Asia (28 studies) and Europe (20 studies). The numbers of children randomised ranged from 14 to 211. Risk of bias assessment indicated that 32 and 33 studies were at low risk of bias for sequence generation and allocation concealment, respectively. Eleven studies were at low risk of performance bias and 13 were at low risk of detection bias. Forty-eight and 36 studies were at low risk of incomplete and selective reporting, respectively. Rituximab with or without prednisone compared with placebo with or without prednisone probably reduces the number of children experiencing relapse at six months (5 studies, 182 children: RR 0.22, 95% CI 0.11 to 0.43) and 12 months (3 studies, 108 children: RR 0.38, 95% CI 0.13 to 1.09) (moderate certainty), may increase the number with severe infusion reactions (4 studies, 162 children: RR 5.21, 95% CI 1.19 to 22.89; low certainty), but not severe infection or arthropathy (low certainty). Rituximab compared with tacrolimus probably reduces the risk of relapse at 12 months (4 studies, 238 children: RR 0.64, 95% CI 0.42 to 0.96) and may reduce the risk of relapse when compared with low dose mycophenolate mofetil (MMF) (1 study, 30 children: RR 0.17, 95% CI 0.04 to 0.62). Rituximab followed by MMF for 500 days reduces the risk of relapse compared with rituximab followed by placebo for 500 days (1 study, 78 children: RR 0.29, 95% CI 0.13 to 0.63; high certainty). Rituximab probably does not differ from ofatumumab in the riisk of relapse and 12 months (1 study, 140 children: RR 1.03, 95% CI 0.75 to 1.41; moderate certainty) or in adverse events. MMF and levamisole (1 study, 149 children: RR 0.90, 95% CI 0.70 to 1.16) may have similar effects on the number of children who relapse at 12 months (low certainty). Cyclosporin compared with MMF may reduce the risk of relapse at 12 months (3 studies, 114 children: RR 1.57, 95% CI 1.08 to 2.30) (low certainty). Levamisole compared with steroids or placebo may reduce the number of children with relapse during treatment (8 studies, 474 children: RR 0.52, 95% CI 0.33 to 0.82) (low certainty). Preliminary data from single studies indicate that levamisole and prednisone compared with prednisone alone may delay the onset of relapse after the initial episode of SSNS and that levamisole compared with increasing prednisone administration from alternate day to daily at the onset of infection may reduce the risk of relapse with infection (low certainty). Cyclosporin compared with prednisone may reduce the number of children who relapse (1 study, 104 children: RR 0.33, 95% CI 0.13 to 0.83) (low certainty). Alkylating agents compared with cyclosporin may make little or no difference to the risk of relapse during cyclosporin treatment (2 studies, 95 children: RR 0.91, 95% CI 0.55 to 1.48) (low certainty evidence) but may reduce the risk of relapse at 12 to 24 months (2 studies, 95 children: RR 0.51, 95% CI 0.35 to 0.74) (low certainty). Alkylating agents (cyclophosphamide and chlorambucil) compared with prednisone probably reduce the number of children who experience relapse at six to 12 months (6 studies, 202 children: RR 0.44, 95% CI 0.32 to 0.60) and at 12 to 24 months (4 studies, 59 children: RR 0.20, 95% CI 0.09 to 0.46) (moderate certainty).

AUTHORS' CONCLUSIONS

New studies incorporated in this review update indicate that rituximab compared with prednisone, tacrolimus, or MMF is a valuable additional agent for managing children with relapsing SSNS. Comparative studies of CNIs, MMF, and levamisole suggest that CNIs may be more effective than MMF and that levamisole may be similar in efficacy to MMF. Important new studies suggest that MMF prolongs remission following rituximab, that levamisole may prevent infection-related relapse more effectively than changing from alternate-day to daily prednisone and that levamisole and prednisone compared with prednisone alone may prolong the time to first relapse. There are currently 23 ongoing studies which should improve our understanding of how to treat children with frequently relapsing SSNS.

Therapeutic trials in difficult to treat steroid sensitive nephrotic syndrome: challenges and future directions

Steroid sensitive nephrotic syndrome is a common condition in pediatric nephrology, and most children have excellent outcomes. Yet, 50% of children will require steroid-sparing agents due to frequently relapsing disease and may suffer consequences from steroid dependence or use of steroid-sparing agents. Several steroid-sparing therapeutic agents are available with few high quality randomized controlled trials to compare efficacy leading to reliance on observational data for clinical guidance. Reported trials focus on short-term outcomes such as time to first relapse, relapse rates up to 1-2 years of follow-up, and few have studied long-term remission. Trial designs often do not consider inter-individual variability, and differing response to treatments may occur due to heterogeneity in pathogenic mechanisms, and genetic and environmental influences. Strategies are proposed to improve the quantity and quality of trials in steroid sensitive nephrotic syndrome with integration of biomarkers, novel trial designs, and standardized outcomes, especially for long-term remission. Collaborative efforts among international trial networks will help move us toward a shared goal of finding a cure for children with nephrotic syndrome.

Efficacy and safety of levamisole in childhood nephrotic syndrome: A meta-analysis

Present evidence regarding the efficacy and safety of levamisole in childhood nephrotic syndrome (NS), particularly the steroid-sensitive NS (SSNS), is limited. We searched relevant databases such as PubMed/MEDLINE, Embase, Google Scholar, and Cochrane CENTRAL till June 30, 2020. We included 12 studies for evidence synthesis (5 were clinical trials that included 326 children). The proportion of children without relapses at 6-12 months was higher in the levamisole group as compared to steroids (relative risk [RR]: 5.9 [95% Confidence interval (CI): 0.13-264.8], I2 = 85%). Levamisole as compared to the control increased the proportion of children without relapses at 6-12 months (RR: 3.55 [95% CI: 2.19-5.75], I2 = 0%). The GRADE evidence was of "very-low certainty" except for the comparison of levamisole with control, the latter being of "moderate certainty." To conclude, levamisole given to children with SSNS is beneficial in preventing relapses and achieving remission as compared to placebo or low-dose steroids. Good-quality trials are needed to provide a robust evidence in this regard. PROSPERO Registration number: CRD42018086247.

Non-corticosteroid immunosuppressive medications for steroid-sensitive nephrotic syndrome in children

BACKGROUND

About 80% of children with steroid-sensitive nephrotic syndrome (SSNS) have relapses. Of these children, half relapse frequently, and are at risk of adverse effects from corticosteroids. While non-corticosteroid immunosuppressive medications prolong periods of remission, they have significant potential adverse effects. Currently, there is no consensus about the most appropriate second-line agent in children who are steroid sensitive, but who continue to relapse. In addition, these medications could be used with corticosteroids in the initial episode of SSNS to prolong the period of remission. This is the fourth update of a review first published in 2001 and updated in 2005, 2008 and 2013.

OBJECTIVES

To evaluate the benefits and harms of non-corticosteroid immunosuppressive medications in SSNS in children with a relapsing course of SSNS and in children with their first episode of nephrotic syndrome.

SEARCH METHODS

We searched the Cochrane Kidney and Transplant Register of Studies up to 10 March 2020 through contact with the Information Specialist using search terms relevant to this review. Studies in the Register are identified through searches of CENTRAL, MEDLINE, and EMBASE, conference proceedings, the International Clinical Trials Register (ICTRP) Search Portal and ClinicalTrials.gov.

SELECTION CRITERIA

Randomised controlled trials (RCTs) or quasi-RCTs were included if they involved children with SSNS and compared non-corticosteroid immunosuppressive medications with placebo, corticosteroids (prednisone or prednisolone) or no treatment; compared different non-corticosteroid immunosuppressive medications or different doses, durations or routes of administration of the same non-corticosteroid immunosuppressive medication.

DATA COLLECTION AND ANALYSIS

Two authors independently assessed study eligibility, risk of bias of the included studies and extracted data. Statistical analyses were performed using a random-effects model and results expressed as risk ratio (RR) for dichotomous outcomes or mean difference (MD) for continuous outcomes with 95% confidence intervals (CI). The certainty of the evidence was assessed using GRADE.

MAIN RESULTS

We identified 43 studies (91 reports) and included data from 2428 children. Risk of bias assessment indicated that 21 and 24 studies were at low risk of bias for sequence generation and allocation concealment respectively. Nine studies were at low risk of performance bias and 10 were at low risk of detection bias. Thirty-seven and 27 studies were at low risk of incomplete and selective reporting respectively. Rituximab (in combination with calcineurin inhibitors (CNI) and prednisolone) versus CNI and prednisolone probably reduces the number of children who relapse at six months (5 studies, 269 children: RR 0.23, 95% CI 0.12 to 0.43) and 12 months (3 studies, 198 children: RR 0.63, 95% CI 0.42 to 0.93) (moderate certainty evidence). At six months, rituximab resulted in 126 children/1000 relapsing compared with 548 children/1000 treated with conservative treatments. Rituximab may result in infusion reactions (4 studies, 252 children: RR 5.83, 95% CI 1.34 to 25.29). Mycophenolate mofetil (MMF) and levamisole may have similar effects on the number of children who relapse at 12 months (1 study, 149 children: RR 0.90, 95% CI 0.70 to 1.16). MMF may have a similar effect on the number of children relapsing compared to cyclosporin (2 studies, 82 children: RR 1.90, 95% CI 0.66 to 5.46) (low certainty evidence). MMF compared to cyclosporin is probably less likely to result in hypertrichosis (3 studies, 140 children: RR 0.23, 95% CI 0.10 to 0.50) and gum hypertrophy (3 studies, 144 children: RR 0.09, 95% CI 0.07 to 0.42) (low certainty evidence). Levamisole compared with steroids or placebo may reduce the number of children with relapse during treatment (8 studies, 474 children: RR 0.52, 95% CI 0.33 to 0.82) (low certainty evidence). Levamisole compared to cyclophosphamide may make little or no difference to the risk for relapse after 6 to 9 months (2 studies, 97 children: RR 1.17, 95% CI 0.76 to 1.81) (low certainty evidence). Cyclosporin compared with prednisolone may reduce the number of children who relapse (1 study, 104 children: RR 0.33, 95% CI 0.13 to 0.83) (low certainty evidence). Alkylating agents compared with cyclosporin may make little or no difference to the risk of relapse during cyclosporin treatment (2 studies, 95 children: RR 0.91, 95% CI 0.55 to 1.48) (low certainty evidence) but may reduce the risk of relapse at 12 to 24 months (2 studies, 95 children: RR 0.51, 95% CI 0.35 to 0.74), suggesting that the benefit of the alkylating agents may be sustained beyond the on-treatment period (low certainty evidence). Alkylating agents (cyclophosphamide and chlorambucil) compared with prednisone probably reduce the number of children, who experience relapse at six to 12 months (6 studies, 202 children: RR 0.44, 95% CI 0.32 to 0.60) and at 12 to 24 months (4 studies, 59 children: RR 0.20, 95% CI 0.09 to 0.46) (moderate certainty evidence). IV cyclophosphamide may reduce the number of children with relapse compared with oral cyclophosphamide at 6 months (2 studies, 83 children: RR 0.54, 95% CI 0.34 to 0.88), but not at 12 to 24 months (2 studies, 83 children: RR 0.99, 95% CI 0.76 to 1.29) and may result in fewer infections (2 studies, 83 children: RR 0.14, 95% CI 0.03 to 0.72) (low certainty evidence). Cyclophosphamide compared to chlorambucil may make little or no difference in the risk of relapse after 12 months (1 study, 50 children: RR 1.31, 95% CI 0.80 to 2.13) (low certainty evidence).

AUTHORS' CONCLUSIONS

New studies incorporated in this review indicate that rituximab is a valuable additional agent for managing children with steroid-dependent nephrotic syndrome. However, the treatment effect is temporary, and many children will require additional courses of rituximab. The long-term adverse effects of this treatment are not known. Comparative studies of CNIs, MMF, levamisole and alkylating agents have demonstrated little or no differences in efficacy but, because of insufficient power; clinically important differences in treatment effects have not been completely excluded.

Bone mineral density and vitamin D status in children with remission phase of steroid-sensitive nephrotic syndrome

Children with idiopathic nephrotic syndrome are primarily treated with glucocorticoids (GCs), but long-term GC use can lead to undesired side effects. We investigated the bone mineral density (BMD) and 25-hydroxyvitamin D (25-OH D) levels in children with the remission phase of steroid-sensitive nephrotic syndrome (SSNS). This study included 32 patients with SSNS who had not received GC treatment in the last 6 months and a control group of 20 healthy children. Serum levels of calcium, phosphate, alkaline phosphatase, 25-(OH)D, and parathyroid hormone (PTH) were measured. BMD was determined in the lumbar spinal region using dual-energy X-ray absorptiometry (DEXA). Serum 25-(OH)D levels were lower in the SSNS patients than in the healthy children (P <0.05), with 22 patients (68.8%) having Z-scores <-1. The Z-scores were positively correlated with 25-(OH)D levels (r = 0.424, P <0.05). PTH levels were higher in patients with osteoporosis than in patients with Z-scores ≥-1 (P <0.05). Bone mineral content and BMD were positively correlated with the age of diagnosis (P <0.01). Receiver-operating characteristic curve analysis showed that the cutoff value of 25-(OH)D levels for predicting low BMD was 14.67 ng/mL with a sensitivity of 90% and a specificity of 64%. The area under the curve (AUC ± standard error) was 0.868 ± 0.064 (95% confidence interval: 0.742-0.994, P = 0.001). Decreased 25-(OH)D levels and the negative effects of long-term GC treatment on BMD persist in SSNS remission phase. Levels of 25-(OH)D <14.67 ng/mL could predict abnormal DEXA scans in children with SSNS remission phase.

Levamisole in Children with Idiopathic Nephrotic Syndrome: Clinical Efficacy and Pathophysiological Aspects

Steroid sensitive nephrotic syndrome is one of the most common pediatric glomerular diseases. Unfortunately, it follows a relapsing and remitting course in the majority of cases, with 50% of all cases relapsing once or even more often. Most children with idiopathic nephrotic syndrome respond initially to steroid therapy, nevertheless repeated courses for patients with relapses induce significant steroid toxicity. Patients with frequent relapses or steroid dependency thus require alternative treatment, such as cyclophosphamide, cyclosporine, tacrolimus, mycophenolate mofetil, levamisole, or rituximab. To reduce the relapse rate, several drugs have been used. Among these, levamisole has been considered the least toxic and least expensive therapy. Several randomized controlled trials (RCT) showed that levamisole is effective in reducing the relapse risk in steroid sensitive forms of nephrotic syndrome with a low frequency of side effects. Levamisole is a synthetic imidazothiazole derivative with immune-modulatory properties. In this article, we review recent data from randomized trials and observational studies to assess the efficacy of levamisole in frequently relapsing nephrotic syndrome and steroid-dependent nephrotic syndrome.

Efficacy and acceptability of immunosuppressive agents for pediatric frequently-relapsing and steroid-dependent nephrotic syndrome: A network meta-analysis of randomized controlled trials

INTRODUCTION

A network meta-analysis was conducted to regard the effects of available immunosuppressive medications in pediatric frequently-relapsing nephrotic syndrome (FRNS) and steroid-dependent nephrotic syndrome (SDNS).

METHODS

We reviewed systematically 26 randomized controlled trials (1311 patients) that compared any of the following immunosuppressive agents to placebo/nontreatment (P/NT) or another drug for FRNS/SDNS treatment in children.

RESULTS

The main outcomes were efficacy and acceptability. At the 6-month, cyclophosphamide, chlorambucil, levamisole, and rituximab had better efficacy than P/NT (odds ratio [OR]: 0.09, 0.03, 0.28, and 0.07, respectively); cyclophosphamide was significantly more effective than azathioprine and chlorambucil. At 12 months, cyclophosphamide, chlorambucil, cyclosporine, levamisole, and rituximab had better efficacy than P/NT (0.10, 0.03, 0.10, 0.23, and 0.07, respectively); Chlorambucil were found to be more efficacious than levamisole and MMF (0.12 and 0.09, respectively). At 24 months, cyclophosphamide, chlorambucil, and levamisole had better efficacy than P/NT (0.09, 0.04, and 0.03, respectively); cyclophosphamide had better efficacy than cyclosporine and vincristine (0.17 and 0.39, respectively).

CONCLUSION

No significant differences in acceptability were found. Our results suggest that cyclophosphamide may be preferred initially in children with FRSN/SDNS, chlorambucil, and rituximab may be acceptable medications for patients with FRSN/SDNS. Long-term follow-up trials focused on gonadal toxicity and limitation of maximum dosage of cyclophosphamide should been carried out.

Efficacy and safety of mycophenolate mofetil versus levamisole in frequently relapsing nephrotic syndrome: an open-label randomized controlled trial

Both levamisole and mycophenolate mofetil (MMF) prevent relapses in patients with frequently relapsing nephrotic syndrome; however, their efficacy has not been compared prospectively. This single-center, randomized, open-label trial enrolled 149 children ages 6-18 years with frequently relapsing or steroid-dependent nephrotic syndrome. Participants were randomized in a 1:1 ratio to receive therapy with MMF (750-1000 mg/m² daily) or levamisole (2-2.5 mg/kg on alternate days) for 1 year; prednisolone was discontinued by 2-3 months. In intention-to-treat analyses, the frequency of relapse was similar between participants treated with MMF and levamisole (mean difference -0.29 relapses/patient-year; 95% confidence interval -0.65, 0.08). Relapse rates declined to almost one-third of baseline for both treatment groups. Therapy with MMF was not superior to levamisole in terms of the proportions of participants with sustained remission (40.8% vs. 34.2%), frequent relapses (14.5% vs. 16.4%), or treatment failure, a composite outcome of frequent relapses, steroid resistance, or significant steroid toxicity (15.8% vs. 20.6%). These outcomes were also similar in time to event analyses. Changes in anthropometry and blood pressure were similar between the groups, and the rates of adverse effects were low in both groups. Flow cytometry in 32 participants demonstrated similar proportions of B cells and CD4+, CD8+, T helper (Th)1, Th2, Th17, and T regulatory (Treg) cells during follow-up. Therapy with MMF was not superior to levamisole in the frequency of relapses, likelihood of sustained remission or corticosteroid sparing in children with frequently relapsing or steroid-dependent nephrotic syndrome. Registration CTRI/2012/02/002394.

A randomized clinical trial indicates that levamisole increases the time to relapse in children with steroid-sensitive idiopathic nephrotic syndrome

Levamisole has been considered the least toxic and least expensive steroid-sparing drug for preventing relapses of steroid-sensitive idiopathic nephrotic syndrome (SSINS). However, evidence for this is limited as previous randomized clinical trials were found to have methodological limitations. Therefore, we conducted an international multicenter, placebo-controlled, double-blind, randomized clinical trial to reassess its usefulness in prevention of relapses in children with SSINS. The efficacy and safety of one year of levamisole treatment in children with SSINS and frequent relapses were evaluated. The primary analysis cohort consisted of 99 patients from 6 countries. Between 100 days and 12 months after the start of study medication, the time to relapse (primary endpoint) was significantly increased in the levamisole compared to the placebo group (hazard ratio 0.22 [95% confidence interval 0.11-0.43]). Significantly, after 12 months of treatment, six percent of placebo patients versus 26 percent of levamisole patients were still in remission. During this period, the most frequent serious adverse event (four of 50 patients) possibly related to levamisole was asymptomatic moderate neutropenia, which was reversible spontaneously or after treatment discontinuation. Thus, in children with SSINS and frequent relapses, levamisole prolonged the time to relapse and also prevented recurrence during one year of treatment compared to prednisone alone. However, regular blood controls are necessary for safety issues.

Levamisole in Frequently-relapsing and Steroid-dependent Nephrotic Syndrome

OBJECTIVE

To evaluate the efficacy of levamisole in children with frequently relapsing nephrotic syndrome (FRNS) and steroid dependent nephrotic syndrome (SDNS) when administered on an alternate day ('initial therapy' in all cases) or daily basis ('rescue therapy' in whom alternate day therapy failed).

METHODS

The records of 95 children (age 1-18y) with FRNS (62) and SDNS (33), who were treated at the Pediatric nephrology clinic, and received levamisole therapy (maximum 2 y duration, between 2010-2013) with a follow-up period of minimum 1 y, were included.

RESULTS

Alternate day levamisole therapy was efficacious in 73.7% (n=70). The overall efficacy of levamisole therapy was 88.4% (n=84). Levamisole therapy decreased the mean (SD) number of relapses from 4.22 (0.46)/y to 1.35 (0.36)/y (P<0.01); and cumulative median (IQR) prednisolone dosage from 4200 (3200-4300) mg/m2 to 1100 (IQR 500-2900) mg/m2 (P<0.001). On a one-year follow up of the cases in whom levamisole therapy was efficacious during therapy (median 24 mo) (n=84), a frequently relapsing or steroid dependent course continued to persist in 48.8% (41), necessitating oral cyclophosphamide (n= 22) or mycophenolate mofetil (n=19).

CONCLUSION

Daily levamisole therapy was useful in 56% of children who demonstrated failure while on alternate day levamisole therapy, and could be a useful therapeutic option in FRNS and SDNS.

Efficacy of higher-dose levamisole in maintaining remission in steroid-dependant nephrotic syndrome

OBJECTIVE

Levamisole (LEV) has been used successfully on an alternate-day regime of 2.5 mg/kg in steroid-dependant nephrotic syndrome (SDNS) to maintain remission. This pilot study was carried out between 2010 and 2015 at a single center in Sri Lanka to evaluate the efficacy of LEV prescribed at 2.5 mg/kg daily, which is double the alternate-day dose.

METHODS

Sequential children with SDNS, relapsing more than twice in the preceding 12 months and previously treated with LEV and low-dose alternate-day prednisolone (0.1-0.6 mg/kg) were recruited to the study. This group received LEV (2.5 mg/kg) daily with the same dose of alternate-day prednisolone for 1 year. Urine protein excretion was recorded by parents on a daily basis, and the presence of 3+ proteinuria on 3 consecutive days was considered a relapse. Full blood counts and liver function tests were performed every 3 months to monitor for adverse effects.

RESULTS

Sixty-four children were enrolled into the study; six were excluded due to prescription of other immunosuppressive drugs. Median age was 7.9 years; 33 were boys. The number of relapse episodes was 163 [mean per patient 2.8 ± standard deviation (SD) 0.8] in patients on alternate-day LEV and 77 (mean 1.3 ± SD 0.9) for those on daily LEV during the 12-month period of observation. The P value 0.000 (according to the Wilcoxon signed-rank test) was <0.001. No major adverse events were noted.

CONCLUSIONS

The prescription of daily LEV is effective and safe for maintaining SDNS remission.

Experience with second line drugs in frequently relapsing and steroid dependent childhood nephrotic syndrome in a large Saudi center

BACKGROUND AND OBJECTIVES

To assess the efficacy and safety of second line drugs used at our center in frequently relapsing and steroid dependant (FR/SD) childhood nephrotic syndrome.

PATIENTS AND METHODS

This was a retrospective study over a period of 3 years (July 2012 to July 2015) on the use of 4 second line drugs in FR/SD nephrotic syndrome in children treated at our center. These drugs were Levamisole, Mycophenolate Mofetil (MMF), Cyclophosphamide, and Cyclosporine. We studied the relapse rate per year, cumulative dose of steroids, success, failure, and side effects of these drugs. Statistical analyses were done with the help of a statistician using the T-test and the "N-1"Chi-Square test.

RESULTS

We reviewed the charts of 60 children. All had FR/SD nephrotic syndrome and received a 3 month protocol of prednisolone. 20 received Levamisole (33%), 12 received Cyclophosphamide (20%), 20 received MMF (25%), and 13 received Cyclosporine (22%).All the four drugs significantly reduced the relapse rate and the cumulative dose of steroids (P < .0001). Treatment success was best with Cyclosporine (69.2%), and treatment failure was the least with Cyclosporine (7.6%). However, treatment success and failure with Cyclosporine when compared to other three drugs was not statistically significant. No dangerous side effects were seen with any of the 4 drugs in the observation period.

CONCLUSION

All the second line drugs in our study were equally effective. However, we recommend that the initial treatment of FR/SD nephrotic syndrome should be chosen with the least toxic yet equally efficacious drug Levamisole.

Levamisole therapy in children with frequently relapsing and steroid-dependent nephrotic syndrome: a single-center experience

Introduction

Numerous studies suggest that levamisole, an antihelmintic agent with an immunomodulatory effect, reduces the number of relapses in children with frequently relapsing and steroid-dependent nephrotic syndrome (FRNS/SDNS). The aim of the study was to present a single center’s experience in treatment of FRNS and SDNS with levamisole.

Material and methods

Among 72 children with FRNS/SDNS treated in our department with levamisole in the years 1984-2011 we studied in detail 53 patients (mean age: 6.5 ±3.0 years), in whom the medication was administered for at least 6 months. In these 53 patients we evaluated: the course of the disease before levamisole, the renal biopsy result, medications used, prednisone dose on levamisole initiation, duration of levamisole treatment, time to first relapse and number of relapses on levamisole, and levamisole side effects.

Results

The duration of nephrotic syndrome was 3.4 ±2.9 years, and the number of relapses before levamisole treatment was 6.0 ±3.4. The dose of prednisone on initiation of levamisole treatment was 1.2 ±0.6 mg/kg/24 h, and the duration of levamisole treatment was 15.0 ±7.3 months. During levamisole treatment proteinuria relapsed in 34/53 (64.2%) children, and the time to first relapse was 8.8 ±8.1 months. During levamisole therapy relapses of the disease decreased significantly (2.7 ±2.0 vs. 1.8 ±2.1 relapses/year, p = 0.02). Time to first relapse correlated with total number of relapses (R = –0.59, p < 0.001) and number of relapses in one year during levamisole treatment (R = –0.60, p < 0.001).

Conclusions

Levamisole is effective in reducing the number of relapses in children with frequently relapsing and steroid-dependent nephrotic syndrome. Early relapse of proteinuria on levamisole treatment in children with FRNS/SDNS suggests low efficacy of further treatment.

Long-term efficacy and safety of common steroid-sparing agents in idiopathic nephrotic children

BACKGROUND

Calcineurin inhibitors (CNI), mycophenolate mofetil (MMF), and levamisole are common treatment choices for patients with frequently relapsing (FRNS) and steroid-dependent nephrotic syndrome (SDNS).

METHODS

In this retrospective cohort study, we analyzed the relative efficacy and safety of tacrolimus, MMF, and levamisole over a period of 30 months, in treating 340 children with idiopathic FRNS/SDNS. The children received either MMF 1200 mg/m² daily, or levamisole 2.5 mg/kg on alternate days, or tacrolimus 0.1-0.2 mg/kg daily along with tapering doses of alternate-day prednisolone.

RESULTS

Tacrolimus was associated with a higher rate of 30-month relapse-free survival when compared to MMF (61.7 vs. 38.5 %, p < 0.001), or levamisole (61.7 vs. 24 %, p < 0.001). However, relapse rate increased almost threefold once tacrolimus was stopped, resulting in a higher relapse rate per patient-year when compared to the MMF group (2.0 vs. 1.5, p = 0.013). The cumulative prednisolone dose per patient during the last year of the study period was also increased among tacrolimus group in comparison with MMF group (96.4 vs. 74.4 mg/kg/year, p = 0.004). Independent of the impact of drug choice, the relapse risk was higher in patients with steroid dependency at baseline (HR 2.14, 95 %CI 1.79-2.96, p < 0.0001). In comparison with few minor adverse events in other two cohorts, several serious adverse events were documented in the tacrolimus group.

CONCLUSIONS

Although there are serious safety concerns regarding tacrolimus, it is more effective than MMF or levamisole in maintaining relapse-free survival. However, unlike MMF, the relative efficacy of tacrolimus in preventing further relapses is seen only when the patient is on the drug. Taking together the long-term efficacy and safety data observed, MMF appears as a safe and effective alternative to tacrolimus in managing pediatric FRNS/SDNS.

WITHDRAWN: Efficacy and Safety of Mycophenolate Mofetil Versus Levamisole in Children and Adolescents With Idiopathic Nephrotic Syndrome: Results of a Randomized Clinical Trial

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Efficacy of levamisole in children with frequently relapsing and steroid-dependent nephrotic syndrome

OBJECTIVE

To assess the efficacy of levamisole in frequently relapsing nephrotic syndrome and steroid-dependent nephrotic syndrome.

STUDY DESIGN

Retrospective analysis of hospital case records.

SETTING

Pediatric nephrology department of a tertiary referral pediatric hospital.

PARTICIPANTS

62 children with frequently relapsing nephrotic syndrome and 35 children with steroid-dependent nephrotic syndrome.

METHODS

Case records of children who were diagnosed as steroid-dependant or frequently-relapsing nephrotic syndrome from June 2004 to June 2011, were reviewed. Levamisole was given daily (2 mg/kg/d) along with tapering doses of alternate day steroids after remission on daily steroids.

RESULTS

Levamisole was effective in 77.3% children with a better (80.6%) efficacy in frequently relapsing nephrotic syndrome. A total of 34 children completed 1 year follow-up post levamisole therapy. The cumulative mean (SD) steroid dose 1-year before therapy was 4109(1154) mg/m2 and 1-year post therapy was 661 (11) mg/m2 (P<0.001). The relapses were also less during the period of post-levamisole therapy.

CONCLUSION

Levamisole is an effective alternative therapy in frequently relapsing and steroid-dependent nephrotic syndrome.

The efficacy and safety of rituximab in treating childhood refractory nephrotic syndrome: a meta-analysis

Rituximab is considered to be a promising drug for treating childhood refractory nephrotic syndrome. However, the efficacy and safety of rituximab in treating childhood refractory nephrotic syndrome remain inconclusive. This meta-analysis aimed to investigate the efficacy and safety of rituximab treatment compared with other immunosuppressive agents in children with refractory nephrotic syndrome. Three randomized controlled trials and two comparative control studies were included in our analysis. The included studies were of moderately high quality. Compared with other immunotherapies, rituximab therapy significantly improved relapse-free survival (hazard ratio = 0.49, 95% confidence interval [CI], 0.26–0.92, P = 0.03). Rituximab also achieved a higher rate of complete remission (risk ratio,1.62; 95% CI, 0.92 to 2.84, P = 0.09) and reduced the occurrence of proteinuria (mean difference = −0.25, 95% CI = −0.29 to −0.21, P < 0.00001); however, a more targeted rituximab treatment did not significantly increase serum albumin levels and did not significantly reduce adverse events. Rituximab might be a promising treatment for childhood refractory nephrotic syndrome; however, the long-term effects and cost-effectiveness of rituximab treatment were not fully assessed, and there were limited studies that evaluated the clinical benefits of a concurrent infusion of rituximab plus a steroid compared with an infusion of rituximab only. Additional studies are required to address these issues.

Non-corticosteroid immunosuppressive medications for steroid-sensitive nephrotic syndrome in children

BACKGROUND

About 80% to 90% of children with steroid-sensitive nephrotic syndrome (SSNS) have relapses. Of these children, around half relapse frequently, and are at risk of adverse effects from corticosteroids. Non-corticosteroid immunosuppressive medications are used to prolong periods of remission in these children; however, these medications have significant potential adverse effects. Currently, there is no consensus about the most appropriate second line agent in children who are steroid sensitive, but who continue to relapse. This is the third update of a review first published in 2001 and updated in 2005 and 2008.

OBJECTIVES

To evaluate the benefits and harms of non-corticosteroid immunosuppressive medications in relapsing SSNS in children.

SEARCH METHODS

For this update we searched the Cochrane Renal Group's Specialised Register to June 2013.

SELECTION CRITERIA

Randomised controlled trials (RCTs) or quasi-RCTs were included if they compared non-corticosteroid immunosuppressive medications with placebo, prednisone or no treatment, different non-corticosteroid immunosuppressive medications and different doses, durations or routes of administration of the same non-corticosteroid immunosuppressive medication.

DATA COLLECTION AND ANALYSIS

Two authors independently assessed the risk of bias of the included studies and extracted data. Statistical analyses were performed using a random-effects model and results expressed as risk ratio (RR) or mean difference (MD) with 95% confidence intervals (CI).

MAIN RESULTS

We identified 32 studies (1443 children) of which one study is still ongoing. In the 31 studies with data, risk of bias assessment indicated that 11 (37%) and 16 (53%) studies were at low risk of bias for sequence generation and allocation concealment respectively. Six (29%) studies were at low risk of performance and detection bias. Twenty seven (87%) and 19 (60%) studies were at low risk of incomplete and selective reporting respectively. Alkylating agents (cyclophosphamide and chlorambucil) significantly reduced the risk of relapse at six to 12 months (RR 0.43, 95% CI 0.31 to 0.60) and 12 to 24 months (RR 0.20, 95% CI 0.09 to 0.46) compared with prednisone alone. There was no significant difference in relapse risk at two years between chlorambucil and cyclophosphamide (RR 1.31, 95% CI 0.80 to 2.13). There was no significant difference at one year between intravenous and oral cyclophosphamide (RR 0.99, 95% CI 0.76 to 1.29). Cyclosporin was as effective as cyclophosphamide (RR 1.07, 95% CI 0.48 to 2.35) and chlorambucil (RR 0.82, 95% CI 0.44 to 1.53) at the end of therapy while levamisole (RR 0.47, 95% CI 0.24 to 0.89) was more effective than steroids alone. However the effects of cyclosporin and levamisole were not sustained once treatment was stopped. In one small study cyclosporin significantly reduced the relapse rate compared with mycophenolate mofetil (MD 0.75, 95% CI 0.01 to 1.49). Limited data from a cross-over study suggested that cyclosporin was more effective than mycophenolate mofetil in maintaining remission. In steroid- and cyclosporin-dependent disease, rituximab significantly reduced the risk of relapse at three months compared with conventional therapy. Mizoribine and azathioprine were no more effective than placebo or prednisone alone in maintaining remission.

AUTHORS' CONCLUSIONS

Eight-week courses of cyclophosphamide or chlorambucil and prolonged courses of cyclosporin and levamisole reduce the risk of relapse in children with relapsing SSNS compared with corticosteroids alone. Limited data indicate that mycophenolate mofetil and rituximab are valuable additional medications for relapsing SSNS. However clinically important differences in efficacy are possible and further comparative studies are still needed.

Saquinavir in steroid-dependent and -resistant nephrotic syndrome: a pilot study

BACKGROUND

Some difficult cases of idiopathic nephrotic syndrome (NS) have been treated with a HIV protease inhibitor provided with proteasome-inhibiting activity. The objective of this study was to limit nuclear factor κB (NF-κB) activation which is up-regulated in these patients, aiming at decreasing proteinuria and prednisone need.

METHODS

Ten cases with long-lasting (up to 15 years) history of NS with steroid dependence (six cases, of which three with secondary steroid resistance) or resistance to steroids (four cases) unsuccessfully treated with multiple immunosuppressive drugs, accepted a treatment with the protease inhibitor saquinavir. p50/p65 NF-κB nuclear localization and immunoproteasome/proteasome messenger RNA (mRNA) were monitored in peripheral blood mononuclear cells (PBMCs). The effects of saquinavir on NF-κB nuclear localization in cultured PBMCs and in immortalized human podocytes were assessed.

RESULTS

After a median follow-up of 14.7 months (6-68.7), 1/4 primary steroid-resistant NS (SRNS) and 5/6 steroid-dependent NS or secondary SRNS became infrequent (5) or frequent (1) relapsers, with 63% prednisone reduction (from 25.3 to 8.4 mg/kg/month, P = 0.015). Saquinavir was effective in association with low doses of calcineurin inhibitors (cyclosporine 2 mg/kg/day or tacrolimus 0.01-0.06 mg/kg/day). No side effects were observed apart from transitory mild diarrhoea. In PBMCs, NF-κB was down-regulated, while MECL-1 immunoproteasome/beta2 proteasome mRNA ratio was reversed to normal values. In culture, saquinavir blunted NF-κB activation in human podocytes and in PBMCs.

CONCLUSIONS

In this pilot study, a HIV antiprotease drug reduced proteinuria and had a steroid-sparing effect in some multidrug-resistant/-dependent NS. This observation warrants further investigation.

Treatment course of steroid-dependent nephrotic syndrome: emphasized on treatment effect

AIM

Children with steroid-dependent nephrotic syndrome (SDNS) need long-term steroid usage to maintain sustained remission. Cyclophosphamide is a well-known alternative agent to spare the use of steroids and avoid the side-effects that result from long-term steroid therapy. Most children may continue to have SDNS despite receiving cyclophosphamide. Additional alternative drugs may be needed. In the present study, the effects on SDNS of sequential treatment after cyclophosphamide usage were established.

METHODS

Forty-six children with SDNS were enrolled in this retrospective uncontrolled study. In addition to prednisolone, patients were treated with cyclophosphamide as a first-line alternative drug. Children who still had SDNS despite cyclophosphamide therapy received chlorambucil, levamisole or another course of cyclophosphamide. The treatment responses were recorded and the mean duration of follow up was 96 months.

RESULTS

Seventeen patients (37%) experienced no relapse after cyclophosphamide therapy. Twenty-five patients (54%) had varied responses. Only four patients showed no effect. Children who still had SDNS despite cyclophosphamide therapy received second or more alternative drugs. Cyclophosphamide with or without chlorambucil resolved steroid-dependency in 33 of 46 (72%) children who either had complete remission or developed steroid-sensitive, rather than steroid-dependent, nephrotic syndrome.

CONCLUSION

With the exception of four patients who were lost to follow up and four who were refractory and needed other treatment, most children with SDNS could spare the steroid (complete remission or steroid sensitive nephrotic syndrome) after using one or more of these modulating agents.

Short- and long-term efficacy of levamisole as adjunctive therapy in childhood nephrotic syndrome

Many children with steroid-dependent nephrotic syndrome (NS) have significant sequelae despite steroid-sparing therapies. Levamisole may reduce short-term relapse frequency (RF) with minimal side effects. Little data exist, however, as to its long-term effect. To assess both short- and long-term efficacy in NS, RF and cumulative annual steroid burden were quantified in ten consecutive children with steroid-dependent NS treated with levamisole. Data were analyzed for three time periods: 1 year prior to levamisole therapy (Pre-Lev), during 1 year of levamisole therapy (During-Lev), and the year after cessation of all levamisole therapy (Off-Lev). Median RF fell from 6.0 (4.0-9.0) relapses/patient per year Pre-Lev to 0.0 (0.0-4.0) During-Lev (p = 0.002) with 6/10 patients having no relapse and 0.5 (0.0-8.0) Off-Lev (p = 0.01) with 5/10 patients without relapse. Concurrently, cumulative annual steroid burden fell from 6,067 (1,660-8,691) mg/m(2) per year Pre-Lev to 2,920 (782-5,271) During-Lev (p = 0.002) and 716 (0-3,637) Off-Lev (p = 0.002). In 4/5 hypertensive children, blood pressure normalized During-Lev. Somatic indices also improved: height Z scores, which fell from 0.8 (-2.4 to 3.6) at diagnosis to -0.6 (-2.7 to 0.4) Pre-Lev (p = 0.004), remained stable at -0.6 (-3.0 to 0.6) after 1 year of therapy and -0.5 (-2.6 to 0.2) Off-Lev. Height velocity improved from 3.0 (0.3-6.0) cm/year Pre-Lev to 3.7 (0.0-8.0) cm/year During-Lev and 5.4 (0.0-9.1) Off-Lev. We conclude that levamisole is an effective short- and long-term steroid-sparing agent in pediatric NS.

Evaluation and management of steroid-sensitive nephrotic syndrome

PURPOSE OF REVIEW

This review examines new literature published in 2006 and 2007 on steroid-sensitive nephrotic syndrome.

RECENT FINDINGS

Steroid-sensitive nephrotic syndrome has long been thought to be due to lymphocyte-derived circulating factors leading to podocyte injury with subsequent proteinuria. New studies support this mechanism and implicate the T helper 2 cytokine IL-13. In addition a genetic mutation in familial nephrotic syndrome has been reported in a child, who responded to corticosteroid therapy. There are new clinical trial data supporting the efficacy of levamisole in steroid-sensitive nephrotic syndrome and preliminary trial data on mycophenolate mofetil supporting its efficacy as a steroid-sparing agent. Case reports support the use of the B cell-depleting antibody rituximab in steroid-sensitive nephrotic syndrome. Finally there is a meta-analysis of six studies suggesting an increase in the incidence of focal and segmental glomerulosclerosis in steroid-sensitive nephrotic syndrome over the last 20 years.

SUMMARY

Progress has been made towards elucidating the cause of steroid-sensitive nephrotic syndrome. Data from adequately powered randomized controlled trials are still required to evaluate therapies for frequently relapsing and steroid-dependent steroid-sensitive nephrotic syndrome.

Non-corticosteroid treatment for nephrotic syndrome in children

BACKGROUND

Eighty to 90% of children with steroid-sensitive nephrotic syndrome (SSNS) have relapses. About half relapse frequently and are at risk of the adverse effects of corticosteroids. Non-corticosteroid immunosuppressive agents are used to prolong periods of remission in these children, however these agents have significant potential adverse effects. Currently there is no consensus as to the most appropriate second line agent in children who are steroid sensitive, but who continue to relapse.

OBJECTIVES

To evaluate the benefits and harms of non-corticosteroid immunosuppressive agents in relapsing SSNS in children.

SEARCH STRATEGY

We searched the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, EMBASE, reference lists, conference abstracts and contact with known investigators. Search date: September 2007

SELECTION CRITERIA

Randomised controlled trials (RCTs) or quasi-RCTs were included if they compared non-corticosteroid agents with placebo, prednisone or no treatment, different doses and/or durations of the same non-corticosteroid agent, different non-corticosteroid agents.

DATA COLLECTION AND ANALYSIS

Two authors independently assessed study quality and extracted data. Statistical analyses were performed using a random effects model and results expressed as relative risk (RR) with 95% confidence intervals (CI).

MAIN RESULTS

We identified 26 studies (1173 children). Cyclophosphamide (RR 0.44, 95% CI 0.26 to 0.73) and chlorambucil (RR 0.15, 95% CI 0.02 to 0.95) significantly reduced the relapse risk at six to twelve months compared with prednisone alone. There was no difference in relapse risk at two years between chlorambucil and cyclophosphamide (RR 1.31, 95% CI 0.80 to 2.13). There was no difference at one year between intravenous and oral cyclophosphamide (RR 0.99, 95% CI 0.76 to 1.29). Cyclosporin was as effective as cyclophosphamide (RR 1.07, 95% CI 0.48 to 2.35) and chlorambucil (RR 0.82, 95% CI 0.44 to 1.53) and levamisole (RR 0.43, 95% CI 0.27 to 0.68) was more effective than steroids alone but the effects were not sustained once treatment was stopped. There was no difference in the risk for relapse between mycophenolate mofetil and cyclosporin (RR 5.00, 95% CI 0.68 to 36.66) but CI were large. Mizoribine and azathioprine were no more effective than placebo or prednisone alone in maintaining remission.

AUTHORS' CONCLUSIONS

Eight week courses of cyclophosphamide or chlorambucil and prolonged courses of cyclosporin and levamisole reduce the risk of relapse in children with relapsing SSNS compared with corticosteroids alone. Clinically important differences in efficacy are possible and further comparative studies are still needed.

Mycophenolate Mofetil in Children with Frequently Relapsing Nephrotic Syndrome: A Report from the Southwest Pediatric Nephrology Study Group

Children with frequently relapsing nephrotic syndrome (FRNS) often develop adverse effects from prednisone. Attempts to induce long-term remission in such patients have had varying levels of success. In this multicenter, prospective, open-label study, 14 centers enrolled 33 patients with FRNS, all of whom were in remission at the time of entry. Six of the patients were steroid dependent. The patients received mycophenolate mofetil (MMF) 600 mg/m(2) twice daily (maximum 1 g twice daily) for 6 mo. A tapering dosage of alternate-day prednisone was given to each patient during the first 16 wk of MMF therapy. Patients were monitored for relapses of NS during and after MMF therapy. Treatment failure was defined as a relapse of NS. The patients had the following features at study entry: Age 6.8 +/- 2.7 yr (range 2 to 15 yr); 56% male, 44% female; and 50% white; 25% black, and 25% other. Estimated GFR at entry was 138 +/- 42 ml/min per 1.73 m(2). Twenty-four (75%) of 32 patients stayed in remission throughout the 6 mo of MMF therapy. The relapse rate in these patients improved from one episode every 2 mo before MMF to one every 14.7 mo after MMF. Eight patients stayed in remission during the post-MMF period, for periods of 18 to 30 mo, whereas 16 relapsed after stopping MMF. Eight (25%) of 32 patients relapsed while taking MMF. It is concluded that MMF is effective for maintaining remission in patients who have FRNS and receive treatment for at least 6 mo and is associated with a low incidence of adverse events.