CIDP

The main purpose of this study is to demonstrate the efficacy and safety of empasiprubart in adults with CIDP. The study consists of a part A where participants will either receive empasiprubart or placebo for 24 weeks (6 months). Following part A, participants will enter part B in which all participants will receive empasiprubart for 96 weeks (24 months). More information can be found here: https://clinicaltrials.argenx.com/emnergize

The main purpose of this study is to compare empasiprubart and IVIg for treating people with CIDP. This study consists of a Part A where participants will either receive empasiprubart and a placebo resembling IVIg, or IVIg and a placebo resembling empasiprubart for 24 weeks (6 months). Following Part A, participants will enter Part B in which all participants will receive empasiprubart for 96 weeks (24 months). More information can be found here: https://clinicaltrials.argenx.com/emvigorate

The main purpose of the study is to determine the correct dose of empasiprubart in adolescent participants. It also aims to evaluate if empasiprubart may work and how safe it is for the use in children living with CIDP. The study consists of an open label treatment phase where participants will receive empasiprubart for up to 27 months approximately. After the final dose of empasiprubart, participants will enter a safety follow-up period for up to 14 months approximately. The overall study duration for each participant is up to 43 months. More information can be found here: clinicaltrials.argenx.com/emlight

This is a randomized controlled study evaluating safety and efficacy of repeated immunoadsorption versus immunoglobulins in steroid-refractory Chronic Inflammatory Demyelinating Polyneuropathy (CIDP).

The aims of this study are to assess the real-world effectiveness of efgartigimod in treating chronic inflammatory demyelinating polyradiculoneuropathy (CIDP), describe the "treatment journey" of participants with CIDP, and assess the utilization of health care services among adult participants with CIDP who initiate treatment with efgartigimod. As this is a noninterventional study, treatment choices and decisions will be left to the discretion of participants and their physicians, according to the standard of care. Each participant will be prospectively followed for up to 2 years from the date of initial administration of efgartigimod.

The aim of the Pre-Approval Access program is to provide efgartigimod PH20 SC treatment to patients with CIDP who are ineligible to participate in a clinical study and have unmet medical need despite available treatment options. The program will continue until the patient discontinues treatment or until the reimbursement process for CIDP concludes, whichever comes first.

Current dosing practices for immunoglobulin G (IgG) may be inadequate in extreme body weight. The current study will evaluate the influence of body composition on intravenous and subcutaneous administration of immunoglobulin G in patients.

Vitaccess Real CIDP (VRCIDP) is a patient registry designed to capture longitudinal observational data on chronic inflammatory demyelinating polyneuropathy (CIDP), its treatment, and impact on symptoms, daily activities, and quality of life (QoL). The duration of the registry is 10 years from launch, and approximately 300 patients will be recruited in the US and Europe with no defined upper limit. The registry will link relevant patient- and healthcare professional (HCP)-reported data with clinical data from electronic medical records (EMR). Patient reported and eCRF data will be linked via a unique ID and PIN assigned to each participant at enrolment. Patients will be recruited at clinical sites in all participating countries. In the US only, patients can additionally be recruited via community neurologists or direct-to-patient recruitment.

Patients who have immune mediated diseases commonly undergo plasma exchange (PLEX) procedures to remove pathological substances, typically believed to be antibodies. At our facility about 400 of these procedures are performed annually on 40-60 different patients. These procedures are considered within the standard of care for these patients and are covered by insurance. This study will not influence the treatment plan for subjects who participate in this study. The goal of the study is to collect and cryopreserve blood biospecimens (plasma, serum, PBMCs) for current and future studies. Any patient undergoing plasma exchange procedures will be eligible for the study. Patients or the legally authorized representative (LAR) will be consented for the study as soon as feasible after the are referred to DeGowin for plasma exchange. The immediate objective of the study is to examine antibody levels (IgG/IgM) and BAFF levels in the blood of these patients over the course of the plasma exchange treatments. Specimens and clinical data will be collected such that other immune factors that may regulate B cell survival, proliferation and antibody secretion can be studied. Another goal of the study is to isolate and cryopreserve PBMCs at different points during the patient's treatment. This would allow the study of immune cells that may mediate these diseases. The study will also follow pathological antibodies over time in these patients so biospecimens can be obtained even after the completion of their course of plasma exchange treatments. The collection of biospecimens and clinical information from these subjects will help us understand the impact of plasma exchange on both normal and pathological immune factors in a variety of patients undergoing these procedures.

The goal of this clinical trial is to learn if the drug called rituximab causes remission in patients with chronic inflammatory demyelinating polyneuropathy (CIDP). The aim is to investigate this in two types of patients, those who are newly diagnosed, and those who are already being treated and are dependent on the current standard therapy: immunoglobulins administered through infusion (IVIg) or through injection (SCIg). The main questions this trial aims to answer are: * To assess the effectiveness of rituximab * Whether it is possible and useful to prescribe patients rituximab who experience a relapse after at least six months after their last rituximab treatment. Participants will: * Receive the drug rituximab twice at the beginning of the trial and one additional time at six months. * The newly diagnosed patients will also start another treatment called IVIg, which a nurse will administer every three weeks during the first three to six months. * The patients who already being treated, will continue their regular treatment, until this is slowly reduced and stopped, during months three to six. * Visit the clinic over the course of two years, during which they will have approximately 10 visits, for checkups and tests. * Be asked to fill in questionnaires at each visit, and be asked to have their blood drawn four times.