In addition to overcoming some limitations of the present work (e.g., by considering primary psychiatric disorders as a separate entity to be compared to bvFTD), future meta‐analyses on the still expanding theme of NFL in ALS and FTD should also address the differentiation between the two main pathological forms of FTLD (FTLD‐tau and FTLD‐TDP) [18]. Here, MAPT is linked to amyotrophic lateral sclerosis.