Moreover, higher Aβ42 levels characterized patients with bulbar phenotype compared with those with classic ALS (0.5 vs. −0.01; p = 0.007) (Figure S2), whereas T‐tau positively correlated with ΔFS (β = 0.28; p = 0.016) (Figure 5). This evidence concerns the gene MAPT and amyotrophic lateral sclerosis.