Another link between ALS and FTD are the large intronic hexanucleotide repeat expansions in the C9ORF72 gene located on chromosome 9 found in ALS, FTD, or ALS/FTD cases (DeJesus-Hernandez et al., 2011; Renton et al., 2011; Gijselinck et al., 2012). This evidence concerns the gene C9orf72 and frontotemporal dementia.