Ofatumumab Versus Rituximab in Children With Steroid and Calcineurin Inhibitor Dependent Idiopathic Nephrotic Syndrome

Study Overview
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Brief Summary
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Open-label, two-parallel-arm, controlled randomized clinical trial testing the superiority of Ofatumumab over Rituximab in maintaining steroid- and calcineurin-inhibitor-free disease remission in SD-INS. Eligible participants will enter a 1-month run-in period, during which instruction on urine collection and dipstick readings will be carefully reviewed, compliance assessed, and therapy with RAS inhibitors withdrawn and, in hypertensive children replaced by other anti-hypertensive drug. After run-in period, children will be randomized to either the intervention arm (Ofatumumab) or the comparator arm (Rituximab). After infusion of intervention or comparator, steroids will be maintained at initial dose for 30 days and then tapered off by 0.3 mg/kg per week until complete withdrawal. One week after the steroid withdrawal calcineurin inhibitors will be decreased by 50% and withdrawn within 2 additional weeks. All patients will be followed for up to 24 months. In case of relapses during the study (see outcome section for definition) patients will be treated with 60 mg/m2of prednisone p.o. in order to achieve remission. At remission, patients will be treated with another infusion of either Oftumumab or Rituximab, according to the initial randomization. After infusion of intervention or comparator, steroids will be maintained at initial dose for 30 days and then tapered off by 0.3 mg/kg per week until complete withdrawal. One week after the steroid withdrawal calcineurin-inhibitors will be decreased by 50% and withdrawn within 2 additional weeks. This strategy will be repeated to treat full relapses during the study.

Official Title
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Ofatumumab Versus Rituximab in Children With Steroid and Calcineurin Inhibitor-dependent Idiopathic Nephrotic Syndrome: an Open-label, Randomized, Controlled, Superiority Trial.

Conditions
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Nephrotic Syndrome

Intervention / Treatment
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* Drug: Ofatumumab
* Drug: Rituximab


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: To be eligible for inclusion into this study, participants will have to fulfill the following criteria: To be in complete disease remission Drug dependence: remission has to be maintained with both steroids and CNI steroid dependence is defined by two consecutive relapses during corticosteroid therapy or within 14 days of ceasing therapy. CNI (cyclosporine/tacrolimus) dependence is defined by presence of relapse at discontinuation. Ability to provide consent and assent: parents'/guardian's written informed consent, and child's assent given before any study-related procedure not part of the subject's normal medical care, with the understanding that consent may be withdrawn by the subject at any time without prejudice to his or her future medical care. Age between 2 and 24 years Exclusion Criteria: Children will be excluded if any of the following criteria apply: Positivity to autoimmunity tests (ANA, nDNA, ANCA) Reduction of C3 levels. eGFR<90/ml/min/1,73 m2 valuated according to revised Bedside Schwartz Formula for patients between 2 and 17 years and with CKD-EPI Creatinine 2009 Equation for 18 years old patients. Pregnancy Neoplasm Infections: previous or actual HBV (with HBeAb positivity) or HCV infection CD20 B lymphocytes count <2,5% Treatment with Rituximab or cyclophosphamide in the last 6 months

Ages Eligible for Study
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Minimum Age: 2 Years
Maximum Age: 24 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Ofatumumab<br>Drug Name: Ofatumumab Why: Anti-body/antigen interaction results in cell apoptosis and reduced CD20 positive cell related activities Procedures: methylprednisolone 2 mg/kg infused in 30' IV diluted in 100 ml of normal saline (NaCl 0,9%); oral paracetamol 15 mg/kg ; cetirizine 0,4 mg/kg IV infused slowly in 5 ml of normal saline (NaCl 0,9%) prior to Ofatumumab infusion to reduce common reactions How: Ofatumumab IV: 1500 mg/1.73m2 at 12 ml/hour in the first 30'. Thereafter, the infusion rate can be doubled every 30 minutes up to a maximum of 200 ml/hour. When and how much: once; diluted in 1000 ml of normal saline. | Drug: Ofatumumab<br>* 1500 mg/1.73m2, administered once diluted in 1000 ml of normal saline<br>* Other names: Arzerra;|
| Active Comparator: Rituximab<br>Drug Name: Rituximab (RTX) Why: Anti-body/antigen interaction results in cell apoptosis and reduced CD20 positive cell related activities Procedures: the same as for Ofatumumab Arm How: Rituximab IV: 375 mg/m2; for dosage between 100 and 250 mg RTX will be diluted in 100 ml of normal saline and administered at 2 ml/h for the first 30'; 3 ml/h for the second 30'; 6 ml/h for the third 30'; 15 ml/h until the end. For dosage between 260 and 500 mg RTX will be diluted in 250 ml of normal saline and administered at 6 ml/h for the first 30'; 9 ml/h for the second 30'; 18 ml/h for the third 30'; 36 ml/h until the end. For dosage between 510 and 1000 mg RTX will be diluted in 500 ml of normal saline and administered at 9 ml/h for the first 30'; thereafter, the infusion rate can be doubled every 30 minutes up to a maximum of 72 ml/h. When and how much: once; diluted in 100/250/500 ml of normal saline for dosage respectively between 100-250 mg, 260-500 mg, 510-1000 mg. | Drug: Rituximab<br>* 375 mg/m2, administered once diluted in 100/250/500 ml of normal saline for dosage respectively between 100-250 mg, 260-500 mg, 510-1000 mg.<br>* Other names: Mabthera;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Risk of relapse | The primary endpoints will be risk of relapse at 12 months without steroid or calcineurin-inhibitors. Relapse is defined by uPCR ≥2000 mg/g (≥ 200 mg/mmol) or > 3+ protein on urine dipstick for 3 consecutive days (KDIGO Clinical Practice Guideline for Glomerulonephritis, Kidney International Supplement, 2012 2, 163-171). | 12 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Amount of steroids required to maintain complete disease remission | Complete remission is defined by uPCR <200 mg/g (<20 mg/mmol) or o1+ of protein on urine dipstick for 3 consecutive days (KDIGO Clinical Practice Guideline for Glomerulonephritis, Kidney International Supplement, 2012 2, 163-171). | 6 and 24 months after Ofatumumab or Rituximab pulse | 
| Adverse events | Measurement of frequency and severity of adverse events due to drug infusion | At 1, 3, 6, 9 ,12, 15, 18, 21 and 24 months after drug infusion, during protocol visits. | 
| Abnormal laboratory values | Record of abnormal values in biochemical tests and hematology assessments due to drug infusion | At 1, 3, 6, 9 ,12, 15, 18, 21 and 24 months after drug infusion, during protocol visits. |