TARDBP and amyotrophic lateral sclerosis: TDP-43 levels ranged from 7% to 164% (median = 60%) in the ALS group, 26% to 92% (median = 63%) in the FTLD group, 9% to 105% (median = 24%) in the ALS plus FTLD group, and 5% to 79% (median = 28%) in the control group.