Dupilumab Therapy in Nephrotic Syndrome in Children

ConditionsNephrotic Syndrome in Children Nephrotic Syndrome Steroid-Dependent

Trial statusRecruiting

Trial phasePhase 2

Trial typeInterventional

Biological sexAll

Age6-18

SponsorNational University Hospital, Singapore

About this trial

The goal of this clinical trial is to learn if dupilumab works to treat severe nephrotic syndrome in children. It will also learn about the safety of dupilumab.

The main questions it aims to answer are:

* Does dupilumab reduce the time to relapse of nephrotic syndrome? * What medical problems do participants have when taking dupilumab?

Researchers will compare dupilumab to a placebo (a look-alike substance that contains no drug) to see if dupilumab works to treat severe nephrotic syndrome.

Participants will:

* Receive an injection of dupilumab or placebo (just under the skin) every 2 weeks (if ≥30kg) or every 4 weeks (if \<30kg) for 24 weeks (6 months) * Wean down their prednisolone dose after starting the injections of dupilumab or placebo * Visit the clinic once every 2 weeks for checkups and tests * Keep a nephrotic diary to record down the urine dipstick result each day, together with the dose of prednisolone taken

If protein returns in participant's urine, they will have completed the study at that point. However, if the participant is found to have received the placebo, they will be offered to receive dupilumab for up to 24 weeks.

Eligibility criteria

This trial does not accept healthy volunteers

Qualifiers

Age between 6 years old and 18 years old at the point of recruitment with idiopathic nephrotic syndrome with disease onset between 1-18 years old

Steroid-dependent disease or frequently relapsing disease prior to commencement of maintenance immunosuppression

On oral prednisolone +/- mycophenolate or levamisole only as maintenance therapy for 6 months or more, and with inadequate disease control or steroid toxicity on therapy

Nephrotic relapse or partial relapse (clinical or biochemical) within the last 1 year either unprovoked or during prednisolone wean, and which responded to increase in steroids

Disqualifiers

Pre-existing ophthalmological conditions except refractive errors, squint or mild cataract

Current symptoms of helminth infection or travel to endemic areas, unless helminth infection is excluded

eGFR (by Bedside Schwartz equation) <60 ml/min/1.73m2

Received Rituximab or other B-cell depleting agents within the last 1 year

Trial design

Design model

Parallel

Treatments tested in this trial

Dupilumab
Biological/Vaccine
Subcutaneous injection of Dupilumab for 24 weeks (weight based dosing)
Placebo
Drug
Subcutaneous injection of normal saline placebo (matching dupilumab subcutaneous injection dosing) for 24 weeks
Co-intervention of Prednisolone wean during randomised controlled phase
Drug
The Prednisolone wean will commence 2 weeks after receiving the loading dose of Dupilumab/placebo, with each weaning step 2 weeks apart. Prednisolone will be first weaned to the same dose every other day, if the current dosing is daily (or more frequent). The dose will subsequently weaned to 4 pre-determined levels of 30mg/m2, 15mg/m2, 10mg/m2 and 5mg/m2 every other day, rounding up to the nearest 5mg. For instance, if the current dose of prednisolone is 12mg/m2 every other day, the patient will decrease the dose to 10mg/m2 every other day for 2 weeks, followed by 5mg/m2 every other day for 2 weeks, before discontinuing the drug. If patients enter the trial on Mycophenolate or Levamisole, this will be continued for the duration of the trial at the same dose.
Dupilumab open label extension phase
Biological/Vaccine
Upon nephrotic relapse, participants will be unmasked. If they were given placebo, they will be invited to enrol in an open label extension phase to receive dupilumab for 24 weeks (with dosing identical to the experimental arm).
Co-intervention of Prednisolone wean during open label extension phase
Drug
Patients will also receive prednisolone 60mg/m2/day as a single daily dose (max 60-80mg OD according to physician's discretion) until in remission for 3 days, before prednisolone is weaned to 40mg/m2 every other day for 2 weeks. Doses should be rounded up to nearest 5mg where possible. Prednisolone will then be weaned in steps as per the randomised controlled phase. If patients do not enter full remission after 2 weeks from enrolment into the extension phase, they will be removed from the study. Additional agents, e.g. Mycophenolate, Levamisole, Calcineurin inhibitors should not be started during this time unless there is strong clinical indication.

Treatment groups

66 Participants

are divided into 3 treatment groups

Group A: DupilumabExperimental treatment 2 interventions

Group B: PlaceboPlacebo comparator 2 interventions

Group C: Open label extension phaseOther 2 interventions

Trial outcomes

Primary outcomes

Time to relapse

Relapse will be defined as either (a) urine dipstick ≥3+ on 3 consecutive days, with 1x urine protein creatinine ratio ≥200mg/mmol (2000mg/g), or (b) clinical edema in keeping with nephrotic syndrome accompanied by hypoalbuminaemia (serum albumin \<30g/L), with 1x urine protein creatinine ratio ≥200mg/mmol (2000mg/g). Participants will be expected to record down in a nephrotic diary the urine dipstick result each day, together with the dose of prednisolone taken. Participants are expected to inform the site principal investigator (or designate) if urine dipstick is ≥3+ on 3 consecutive days, and provisions will be made for an ad-hoc urine protein creatinine ratio measurement to determine if relapse has occurred. This should be done within 24 hours of notification by participants. Participants will also be routinely examined for signs of nephrotic syndrome, for example edema, at study visits, and urine protein creatinine ratio will be obtained at each study visit.

Time frame

From enrolment until date of relapse, assessed up to 24 weeks

Secondary outcomes

Time-averaged Albustix quantitation of proteinuria during study period

Participants will be requested to record down in a nephrotic diary their urine dipstick result each day, together with the dose of prednisolone taken. The time-averaged albustix quantitation of proteinuria for the study period will then be calculated.

Time frame

From enrolment until date of relapse, assessed up to 24 weeks

Minimum dose of prednisolone at the end of study

Minimum dose of prednisolone at the end of study - at time of relapse or at 24 weeks, whichever comes first.

Time frame

From enrolment until date of relapse, assessed up to 24 weeks

Percentage reduction in prednisolone dose at the end of study compared to baseline

Percentage reduction in prednisolone dose at the end of study (at time of relapse or at 24 weeks, whichever comes first) compared to baseline

Time frame

At baseline and at time of relapse or at 24 weeks, whichever comes first

Change in health-related quality of life at the end of study compared to baseline

Health-related quality of life will be measured using the Pediatric Quality of Life Inventory (PedsQL) 4.0 Generic Core scales short form. There are 15 questions, where each question is scored from 0 to 4. The total score ranges from 0 to 60, where a higher score represents a lower quality of life, with more problems associated with coping with health and activities, feelings, getting along with others and work/studies.

Time frame

At baseline, 1 month, 3 months, 6 months (or at time of relapse, whichever comes first)

Other outcomes

Change in circulating Th2 cytokines at end of study compared to baseline

Blood will be taken to measure for change in circulating Th2 cytokines (IL-4, IL-5, IL-13), measured in pg/ml. The required biological specimens comprise 3ml of EDTA blood and 12ml of Sodium heparin blood (or alternatively Streck Cyto-chex blood collection tube for Malaysian sites to extend sample viability). These biological specimens will require immediate priority transport to the central trial laboratory for processing on the same day (Singapore) or overnight (Malaysia). This is to help identify biomarkers predictive of dupilumab response.

Time frame

At baseline, 1 month, 3 months, 6 months, (or at time of relapse, whichever comes first)

Change in markers of Th2 polarisation at the end of study compared to baseline

Blood will be taken to measure for change in markers of Th2 polarisation - T-cell GATA3 (protein), STAT6 (protein) and stimulated IL-13 production, all of which will be measured as a percentage. The required biological specimens comprise 3ml of EDTA blood and 12ml of Sodium heparin blood (or alternatively Streck Cyto-chex blood collection tube for Malaysian sites to extend sample viability). These biological specimens will require immediate priority transport to the central trial laboratory for processing on the same day (Singapore) or overnight (Malaysia). This is to help identify biomarkers predictive of dupilumab response.

Time frame

At baseline, 1 month, 3 months, 6 months, (or at time of relapse, whichever comes first)

Number of participants with adverse events

Adverse events would be assessed by questionnaire at each study visit every 2 weeks and reviewed by the site principal investigator within 24 hours. The following questionnaires are applicable: * For \>17 years old, please use Patient-Reported Outcomes Version of the Common Terminology Criteria for Adverse Events (PRO-CTCAE) * For 7-17 years old, please use Pediatric-Patient-Reported Outcomes Version of the Common Terminology Criteria for Adverse Events (PED-PRO-CTCAE) if able to self-report, otherwise use Pediatric-Patient-Reported Outcomes Version of the Common Terminology Criteria for Adverse Events (Caregiver) (PED-PRO-CTCAE \[Caregiver\]). * For \<7 years old, please use Pediatric-Patient-Reported Outcomes Version of the Common Terminology Criteria for Adverse Events (Caregiver) (PED-PRO-CTCAE \[Caregiver\])

Time frame

From enrolment until date of relapse, assessed up to 24 weeks