C9orf72 and amyotrophic lateral sclerosis: Importantly, no quantitative differences are observed in the levels of C9orf72 expression in the brains between FTD/ALS patients with or without C9orf72 repeat expansion and the controls, where intracellular inclusions except for Pick bodies do not express C9orf72 immunoreactivity [1-3,5-7,9,15].