NEFL and amyotrophic lateral sclerosis: Meanwhile, higher concentrations of CSF‐NFL (HR = 2.999, 95% CI: 0.913–9.850, p = 0.040) and CSF‐pNFH (HR = 3.471, 95% CI: 1.030–11.697, p = 0.045) were also significantly associated with a reduced survival in ALS.