Immunoglobulin Dosage and Administration Form in CIDP and MMN

Study Overview
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Brief Summary
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The aim of this study is to evaluate development of hemolysis and the variation in isokinetic muscle strength in two groups of patients with chronic inflammatory demyelinating polyneuropathy (CIDP) or multifocal motor neuropathy (MMN) Patients shifted from 3- or 6-weekly treatment with intravenous immunoglobulin (IVIG) to weekly treatment with subcutanoeus immunoglobulin (SCIG) Patients shifted from SCIG treatment with Subcuvia® or Hizentra® to Gammanorm®. Hypotheses During treatment with IVIG blood hemoglobin will fluctuate with a decline due to infusion, whereas it will remain stable during SCIG treatment without fluctuation Isokinetic muscle strength in affected muscle groups is more stable during treatment with SCIG than with IVIG Blood hemoglobin and changes in muscle strength is comparable during Subcuvia® or Hizentra® and Gammanorm® treatment

Detailed Description
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Due to planned switch of treatment with immunoglobulin at Department of neurology (Rigshospitalet) patients treated with IVIG will be shifted to treatment with SCIG with an unaltered dosage. The medication is administered at home two or three times weekly. IVIG is often administered every 3 to 6 weeks. All patients will be trained in managing the treatment with SCIG by a nurse from the neurological department. When the patient is able to manage the treatment regimen it can be done at home. All patients will be evaluated eight times during the study period. Four times before and four times after shift of treatment. Prior to participation the intervals will be standardized to 3 or 6 weeks giving an extra infusion for those with an interval of 3 weeks, i.e. patients on 4-week interval will be switched to 3-week interval while patients on 5-week interval will be switched to 6-week interval. The dose will be adjusted leading to an unchanged weekly dose of IVIG. All patients will be evaluated in connection to two IVIG infusions. For those receiving 3 infusions examinations will be executed before and 2 weeks after the first and last infusion. SCIG is initiated 2 weeks after the last IVIG infusion. Patients on maintenance therapy with Subcuvia® or Hizentra® will be shifted to treatment with Gammanorm® according to guidelines from the Danish Healthcare Society, the weekly dose of immunoglobulin being unaltered. They will be evaluated 3 times (once before, at the time of shift of SCIG and once after). All evaluations at each time point in both groups consist of measurement of isokinetic muscle strength of four affected muscle groups and blood sampling detecting blood hemoglobin and hemolytic parameters.

Official Title
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The Influence of Immunoglobulin Dosage and Administration on Development of Hemolytic Anemia and Variation on Muscle Strength in Patients With CIDP and MMN

Conditions
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Chronic Inflammatory Demyelinating Polyneuropathy, Multifocal Motor Neuropathy, Hemolytic Anemia

Intervention / Treatment
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* Drug: Immunoglobulins


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Diagnosed with CIDP or MMN fulfilling the EFNS/PNS criteria Maintenance treatment with IVIG or SCIG for at least 3 months Negative result on a pregnancy test (HCG-based assay in urine) for women of childbearing potential and use of a reliable method of contraception for the duration of the study Exclusion Criteria: Pure sensory or severe ataxic CIDP Other cause of neuropathy (incl. pressure neuropathy) Known history of adverse reactions to IgA in other products Exposure to blood or any blood product or plasma derivatives, other than Privigen, within the past 3 months prior to first infusion of Gammanorm Ongoing history of hypersensitivity or persistent reactions to blood or plasma derived products. Requirement of any routine premedication for IgG administration History of malignancies of lymphoid cells and immunodeficiency with lymphoma Severe liver function impairment (ALAT 3 times above upper limit of normal) Known protein-losing enteropathies or proteinuria. Live viral vaccination (such as measles, rubella, mumps and varicella) within the last 2 months prior to first infusion of Gammanorm Treatment with any investigational medicinal product within 3 months prior to first infusion of Gammanorm Medication interfering with hematopoiesis Other immunomodulation therapy than low dose steroid (Prednisolone < 25 mg daily) Known or suspected to abuse alcohol, drugs, psychotropic agents or other chemicals within the past 12 months prior to first infusion of Gammanorm Known or suspected HIV, HCV, or HBV infection Pregnant or nursing women Planned pregnancy during course of the study

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 80 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

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| IVIG to SCIG<br>Patients with CIDP or MMN in maintenance therapy with IVIG every 3rd to 6th week are shifted to weekly SCIG treatment in unaltered dose. | Drug: Immunoglobulins<br>* SCIG dosage is individualized for each patient according to previous IVIG dosage<br>* Other names: Gammanorm(R), immunoglobulin for subcutaneous use;|
| SCIG to SCIG<br>Patients with CIDP or MMN in maintenance therapy with SCIG (Subcuvia(R) or Hizentra(R)) are shifted to treatment with Gammanorm(R) in unaltered weekly dose. | Drug: Immunoglobulins<br>* SCIG dosage is individualized for each patient according to previous IVIG dosage<br>* Other names: Gammanorm(R), immunoglobulin for subcutaneous use;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Variation in blood hemoglobin during treatment with IVIG and SCIG | Patients in treated with IVIG every 6th week are shifted to weekly SCIG treatment in unaltered dose. Blood hemoglobin is measured according to two IVIG infusions, before and two weeks after, and four times with the same intervals during SCIG treatment. SCIG treatment is initiated in week 8. Blood samples are collected at the following time points: Week 0, 2, 6, 8, 12, 14, 18 and 20 | Twenty weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Variation in muscle strength during treatment with two preparations of SCIG | Patients treated with SCIG (Subcuvia(R) or Hizentra(R)) are shifted to treatment with Gammanorm(R) in unaltered weekly dose. Muscle strength are evaluated at enrolment and after 10 weeks of treatment with (Subcuvia(R) or Hizentra(R)) and after 10 weeks of treatment with Gammanorm(R). Treatment is shifted in week 10. Muscle strength is meaured at the following time points: Week 0, 10 and 20 | Twenty weeks | 
| Variation in muscle strength during treatment with IVIG and SCIG | Patients in treated with IVIG every 6th week are shifted to weekly SCIG treatment in unaltered dose. Isokinetic muscle strength is measured according to two IVIG infusions, before and two weeks after, and four times with the same intervals during SCIG treatment. SCIG treatment is initiated in week 8. Muscle strength is measured at the following time points: Week 0, 2, 6, 8, 12, 14, 18 and 20 | Twenty weeks | 
| Variation in blood hemoglobin during treatment with two preparations of SCIG | Patients treated with SCIG (Subcuvia(R) or Hizentra(R)) are shifted to treatment with Gammanorm(R) in unaltered weekly dose. Blood hemoglobin is measured at enrolment and after 10 weeks of treatment with (Subcuvia(R) or Hizentra(R)) and after 10 weeks of treatment with Gammanorm(R). Treatment is shifted in week 10. Blood samples are collected at the following time points: Week 0, 10 and 20 | Twenty weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Immunoglobulins, Intravenous, Immunoglobulins, Subcutaneous