Clinical trial NCT06341205: Personalized Rituximab Treatment Based on Artificial Intelligence in Membranous Nephropathy (iRITUX)
Official title: Study of Artificial Intelligence-based Personalized Rituximab Treatment Protocol in Membranous Nephropathy
Study type: INTERVENTIONAL
Overall status: NOT_YET_RECRUITING
Phase: PHASE3
Conditions: Membranous Nephropathy
Lead sponsor: Centre Hospitalier Universitaire de Nice
Sponsor class: OTHER
First posted: 2024-04-02
Enrollment: 120
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: Membranous nephropathy is an autoimmune disease affecting the kidney, and the most common cause of nephrotic syndrome in non-diabetic Caucasian adults. The course of this disease is highly variable from one individual to another, ranging from spontaneous remission to progressive chronic kidney disease.

The identification of autoantibodies - e.g., the phospholipase A2 receptor type 1 (PLA2R1) - has promoted the use of immunosuppressive drugs such as rituximab which is now a safe and effective first-line treatment for the management of membranous nephropathy. However, up to 40% of patients do not respond to a first course of rituximab treatment. In nephrotic patients, due to urinary drug loss, rituximab blood level is lower than in other autoimmune diseases treated with rituximab without proteinuria. This high urinary drug loss decreases the drug exposure, potentially explaining why rituximab regimen with low dose infusions (375 mg/m2) did not demonstrate efficacy after month-6 compared to a non-immunosuppressive antiproteinuric treatment in a previous study. In contrast, a regimen of two 1-g infusions two weeks apart was associated with a significantly greater remission rate after 6 months.

Recently, the investigators have shown that after two 1-g rituximab infusions, the rituximab blood level 3 months after the first rituximab infusion, was correlated with the likelihood of remission after 6 and 12 months of the rituximab treatment. Patients with positive rituximab blood level 3 months after treatment had a higher chance of remission at month-6 and at month-12 than patients with an undetectable rituximab level at month-3.

Nowadays, machine learning algorithms are increasingly used in medicine, especially in pharmacology, to predict the exposure to a drug, the initial dose to administer or the interval between two infusions.

The objective of this study is to use a machine learning algorithm predicting the risk of having an undetectable residual level of rituximab 3 months after treatment, in order to propose a personalized treatment management with early additional doses of rituximab for the patients at risk.


Eligibility criteria: Inclusion Criteria:

* Age ≥ 18 years
* Ongoing episode of membranous nephropathy diagnosed by the presence of anti-PLA2R1 antibodies detected by ELISA (≥ 14 RU/ml, EUROIMMUN): the result must be validated by the Coordination team before randomization.
* Nephrotic syndrome defined by proteinuria \> 3.5 g/24h (or UPCR \> 3.5 g/g) and serum albumin \< 30 g/L at diagnosis
* Estimated Glomerular Filtration Rate (CKD-EPI formula) \> 30 mL/min/1,73 m2
* Indication for rituximab treatment according to the KDIGO and French guidelines
* Non-immunosuppressive antiproteinuric treatment at stable dose for 2 weeks according to French guidelines, including a renin angiotensin aldosterone system inhibitor, a diuretic and a low-salt diet at maximal tolerated dose (i.e., absence of orthostatic hypotension and no increase in creatinine \> 30%)

Exclusion Criteria:

* Secondary Membranous nephropathy related to cancer, infection, systemic lupus, drug
* Diagnosis of PLA2R1-associated Membranous nephropathy not confirmed by the Coordination team (validation mandatory for randomization)
* Pregnancy or breastfeeding
* Immunosuppressive treatment (including rituximab) in the 6 months preceding inclusion
* Presence of anti-rituximab antibodies detected by Central Lab
* Cancer under treatment
* Patients with active, severe infections
* Hypersensitivity to the active substance or excipients
* Patients severely immunocompromised
* Severe heart failure or severe, uncontrolled cardiac disease

Primary outcomes:
measure: Clinical remission (complete or partial) after 6 months of rituximab initiation
timeFrame: 6 months
Secondary outcomes:
measure: Complete clinical remission after 12 months of rituximab initiation
timeFrame: 12 months
measure: Partial clinical remission after 12 months of rituximab initiation
timeFrame: 12 months
measure: Immunological remission: anti-PLA2R1 depletion
timeFrame: 12 months
measure: Change in urine protein/creatinine ratio (UPCR)
timeFrame: 12 months
measure: Change in serum creatinine
timeFrame: 12 months
measure: Change in renal function
timeFrame: 12 months
measure: Change in the immunological status of the disease
timeFrame: 12 months
measure: Appearance of anti-drug antibodies after rituximab treatment
timeFrame: 12 months
measure: Rituximab underdosed patients
timeFrame: 3 months
measure: Serious adverse events
timeFrame: 84 months
measure: Adaptation of symptomatic treatment
timeFrame: 84 months
measure: Model improvement through machine learning
timeFrame: 6 months
measure: Effect of rituximab on immune profiles
timeFrame: 6 months
Other outcomes:
Locations:
Study officials:
References: