BDNF and major depressive disorder: Cantarelli et al. (2015) compared metabolic parameters, S100B, CRP, and BDNF levels in the group of patients with mood disorders (BD n = 37, MDD n = 13) who had a suicide attempt during the last 15 days, and patients (BD n = 29, MDD n = 7) who had no lifetime history of a suicide attempt.