BDNF and Borderline personality disorder: Further, since Perroud et al. [17] had reported that dialectical behavior therapy (DBT), one of the most frequently applied psychotherapeutic intervention for BPD patients [67], leads to a decrease of previously elevated BDNF methylation levels in BPD patients, we sought to replicate this finding by reassessing the blood and salivary BDNF methylation in a subsample of patients after a 12-week DBT.