Following on from the publication of these original two reports, many further studies have since confirmed the presence of the C9orf72 expansion in familial FTD/ALS cases in various different populations from around the world; for example, Gijselinck et al. also found the same repeat expansion in a Flanders-Belgian cohort study [20]. Here, C9orf72 is linked to amyotrophic lateral sclerosis.