Post hoc analysis of Dunn’s multiple comparison tests revealed significantly higher levels of CSF TDP‐43 in the ALS group compared with those in the CIDP subgroup, CSF NfL in the ALS group compared with those in the CIDP and GBS subgroups, and CSF t‐tau in the ALS group compared with those in the CIDP subgroup. The gene discussed is NEFL; the disease is Guillain-Barre syndrome.