Nf‐ICs levels were higher in C9+ve ALS patients compared to HC‐1 and ALS‐F (Fig. 1H, p = 0.022 and p = 0.030), suggesting that the expression of this marker may be influenced by the C9orf72 genetic status and not by the rate of disease progression. Here, C9orf72 is linked to amyotrophic lateral sclerosis.