A study to assess the long-term safety and efficacy of a subcutaneous formulation of efgartigimod in adults with chronic inflammatory demyelinating polyneuropathy (an autoimmune disorder that affects the peripheral nerves)

You may be able to join if

• 1. Ability to understand the requirements of the trial, provide written informed consent (including consent for the use and disclosure of research-related health information), willingness and ability to comply with the trial protocol procedures (including required trial visits) of this trial. 2. Male or female patient with 1 of the following options: - Have completed the Week-48 visit of Stage B of the ARGX-113-1802 trial and are considered to be eligible for treatment with efgartigimod PH20 SC; or - Have deteriorated during Stage B of the ARGX-113-1802 trial and are considered to be eligible for treatment with efgartigimod PH20 SC, or - Have been offered the participation in the OLE trial due to early termination of the ARGX-113-1802 trial (because sufficient events for the primary endpoint analysis of the that trial have been reached and it is stopped) and are considered to be eligible for treatment with efgartigimod PH20 SC treatment; or - Have completed the Week-48 visit of the previous cycle of the OLE trial and are considered to be eligible to continue with efgartigimod PH20 SC treatment. 3. Women of childbearing potential who have a negative urine pregnancy test at baseline before IMP administration. 4. Women of childbearing potential must use an acceptable method of contraception from signing the ICF until the date of the last dose of IMP