BDNF and alcohol dependence: Our results showed that the correlation between proBDNF level and mBDNF level in the control group (n = 45, r = −0.4238, P = 0.0037; Spearman’s correlation test) and in the alcohol dependence group (n = 45, r = −0.5340, P = 0.0041; Spearman’s correlation test) were significant.