Hizentra® in Inflammatory Neuropathies - pHeNIx Study

Study Overview
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Brief Summary
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The pHeNIx study, a national multicentre prospective non-interventional study, should help to describe the conditions of use for Hizentra® and the methods for switching from the IV to SC route in everyday practice, together with the tolerability and efficacy of treatment, which is monitored using a patient application (PRO: Patient-Reported Outcomes).

Detailed Description
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Chronic Inflammatory Demyelinating Polyneuropathy (CIDP) is a neurological and rare type of autoimmune disorder. Intravenous immunoglobulin (IVIg) is the first-line treatment for CIDP which has been proven to be effective. For several years, published cases have suggested that the Sub-Cutaneous Ig (SCIg) may be an alternative treatment to IVIg in the treatment of CIDP. Compared to IVIg treatment, the SCIg can achieve more stable plasma IgG concentrations, suggesting a potential reduction in the dose exhaustion effect at the end of the cycle, but also fewer systemic effects. SC administration also enables more straightforward treatment to be given for ambulatory patients. Based on the PATH study (NCT01545076), a double blind placebo-controlled, randomised, prospective, international multicentre phase III study, Hizentra® obtained an extension of its marketing authorization for the CIDP indication as maintenance treatment after stabilisation with IVIg. However, in the real-life situation, the literature is still based at present on small series of patient or short-term follow-up periods. However, the methods for switching from the IV to the SC route and the characteristics of patients receiving this treatment are not known. In addition, SCIg administration remote from a specialist centre without assistance from a health professional no longer enables a more regular assessment of the patient in terms of tolerability and efficacy. The pHeNIx study, a national multicentre prospective non-interventional study, should help to describe the conditions of use for Hizentra® and the methods for switching from the IV to SC route in everyday practice, together with the tolerability and efficacy of treatment, which is monitored using a patient application (PRO: Patient-Reported Outcomes). The study duration is estimated to be 36 months in view of: a 24-month inclusion period and a 12-month follow-up period.

Official Title
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Hizentra® in Inflammatory Neuropathies - pHeNIx Study

Conditions
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Chronic Inflammatory Demyelinating Polyneuropathy

Intervention / Treatment
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* Biological: Hizentra


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Adult patient (aged ≥18 years) Patients suffering from CIDP according to EAN/PNS 2021 criteria Planned switch from IVIg to Hizentra® Patient treated with at least 3 courses of IV immunoglobulin and deemed by the investigator to be dependent on immunoglobulins Patient deemed to be stable, with no change in their treatment for the disease during the 3 months prior to inclusion Patients who have a smartphone, a tablet or a computer Patients who have been informed verbally and in writing of the purposes of the study Exclusion Criteria: Concomitant participation in an interventional clinical study

Ages Eligible for Study
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Minimum Age: 18 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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Arms and Interventions

| Intervention/Treatment |
| --- |
|Biological: Hizentra|Solution for injection for subcutaneous use|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Length of time of Continuation of treatment | Non-continuation is defined by: an increase in the INCAT score of over one point measured in a consultation despite a bolus dose of IVIg and/or after increasing the dose of Hizentra® stopping treatment with Hizentra® | up to 12 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The time between the last dose of IVIg and starting Hizentra® |  | At Baseline | 
| The total dose of the last course of IVIg |  | At Baseline | 
| The interval between courses of IVIg |  | At Baseline | 
| The total dose of the first course of Hizentra |  | At Baseline | 
| The number of days of the first course of Hizentra |  | At Baseline | 
| Number of Self-administrations or administrations by a state-registered nurse |  | Up to 12 months | 
| The daily dose of Hizentra |  | Up to 12 months | 
| The daily volume of Hizentra |  | Up to 12 months | 
| Duration of the infusion |  | Up to 12 months | 
| Number of infusion sites |  | Up to 12 months | 
| Number of Patients completing the Patient Reported Outcome (PRO) tests at home |  | Up to 12 months | 
| Rasch-built Overall Disability Scale (RODS) incapacity scale score by patient |  | Up to 12 months | 
| 10-metre walking test score by patient |  | Up to 12 months | 
| Rasch-built Overall Disability Scale (RODS) incapacity scale score by doctor |  | Up to 12 months | 
| 10-metre walking test score by doctor |  | Up to 12 months | 
| Time since the diagnosis of CIDP |  | At baseline | 
| EuroQol-5D (EQ-5D) quality of life score |  | Up to 12 months | 
| Pictorial Representation of Illness and Self Measure (PRISM) score |  | Up to 12 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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CIDP, IgPro20, Hizentra, Subcutaneous Immunoglobulins