CSF NFL is weakly associated with the score of the Frontal Assessment Battery (FAB) in FTD and correlates with the scores of several neuropsychological tests, especially regarding frontal-executive functions, both in FTD and in the subclasses bvFTD and nfvPPA (Scherling et al., 2014; Meeter et al., 2018b). Here, NEFL is linked to frontotemporal dementia.