Majority of the studies that studied CRP levels in ALS patients were from blood, suggesting its easy accessibility (Beers et al., 2020; Chełstowska & Kuźma‐Kozakiewicz, 2020; Cui et al., 2020; De Schaepdryver et al., 2020; Huang et al., 2020; Keizman et al., 2009; Nagel et al., 2017; Sun et al., 2020). This evidence concerns the gene CRP and amyotrophic lateral sclerosis.