ATXN3 and amyotrophic lateral sclerosis: A separate analysis considering the age of onset of FTD or ALS led to the same trend of correlation in HTT (r = −0.16, P = 0.033 for FTD; r = −0.24, P = 0.049 for ALS) conversely to the ATXN3 locus for which the correlation coefficients were not significant when considering the two phenotypes separately.