MS: multiple sclerosis; PN: peripheral neuropathy; SD: standard deviation; IQR: interquartile range; EDSS: expanded disability status scale; Gd: gadolínium; MRI: magnetic resonance imaging; CSF: cerebospinal fluid; GBS: Guillain-Barré syndrome; CIDP: chronic inflammatory demyelinating polyradiculoneuropathy; AIDP: acute inflammatory demyelinating polyneuropathy; CRP: C-reactive protein; GFAP: glial fibrillary acid protein; UCHL-1: ubiquitin C-terminal hydrolase. This evidence concerns the gene GFAP and poikiloderma with neutropenia.