Patients developing neurological syndromes related to administration of any immune checkpoint inhibitors, including central nervous system disorders and neuromuscular toxicties

This is a non-interventional study involving clinical data, neuroimaging analysis, and biological samples. Demographics and clinical data are collected in the database of the French Reference Centre. Additional or missing data will be obtained by contacting the referral physicians. All the neuroimages available will be analysed by dedicated software. Samples are already stored in biobank repositories and collected as part of "good clinical practice" in the diagnostic process of patients with suspected autoimmune encephalitis, meaning that the standard diagnostic and therapeutic approaches will not be altered in the selected study population. Patients have already gave explicit written consent for biological specimens sampling and storage at the "Centre de Ressources Biologiques des Hospices Civils de Lyon" (CRB-HCL) (including tissue, cells or biological fluids). Additional samples for genetic testing will be collected upon explicit written consent.

Neurofilaments will be analysed by MSD.

Meso Scale Discovery Electrochemiluminescence (MSD) uses sandwich enzyme-linked immunosorbent assay (ELISA) method coupled with electro¬chemiluminescence (ECL) detection and plate array technology to provide highly sensitive and multiplexed detection of the analytes of interest (like neurofilaments) in a complex biological matrix.