Most cases of FTLD have either transactive response DNA‐binding protein of 43 kDa (TDP‐43; FTLD‐TDP, 50%) or tau inclusions (FTLD‐tau, 45%), with a small number having inclusions of fused in sarcoma (FUS; FTLD‐FUS, <5%) [1]. This evidence concerns the gene FUS and sarcoma.