Janssen Research & Development, LLC
The main purpose of this study is to evaluate the safety and efficacy of nipocalimab compared to placebo in delaying relapse in adults with chronic inflammatory demyelinating polyneuropathy (CIDP) who initially respond to nipocalimab in Stage A.
Inclusion Criteria: * Adults greater than or equal to (\>=) 18 years of age at the time of consent and as applicable, must also meet the legal age of consent in the jurisdiction in which the study is taking place * Diagnosed with Chronic Inflammatory Demyelinating Polyneuropathy (CIDP) according to criteria of the European Academy of Neurology/Peripheral Nerve Society (EAN/PNS) 2021, progressing or relapsing forms. CIDP diagnosis to be adjudicated by independent committee during screening period * Inflammatory Neuropathy Cause and Treatment (INCAT) disability score between 2 and 9 at the Run-…
Nipocalimab will be administered intravenously.
Placebo will be administered intravenously.