Chronic Inflammatory Demyelinating Polyneuropathy Induced by Immune Checkpoint Inhibitors: Case Reports

Abstract

Neurological immune-related adverse events (irAE) are rare but potentially fatal complications associated with the use of immune checkpoint inhibitors (ICI). Recently, there has been a trend towards an increase in the incidence of these cases.
 We present two case reports of demyelinating polyneuropathy in patients with skin melanoma treated with pembrolizumab or nivolumab. Unawareness of neurological irAE induced by ICI leads to delayed diagnosis and medical treatment, and this may result in persistent neurological deficit or even patients’ death. Neurological irAEs include myasthenia gravis, aseptic meningitis, encephalitis, myelitis, inflammatory demyelinating neuropathy, myositis or their combinations, etc. Considering their variability in patients treated with ICI and poor representation in publications, each case report can be of practical value.