To date BDNF has been reported to be associated with schizophrenia [9]–[12], Parkinson's disease [13]–[16], addictive substance use or dependence [17], Alzheimer's disease [18]–[19], bipolar disorder or depression [20]–[23] and obsessive-compulsive disorder [24]. This evidence concerns the gene BDNF and schizophrenia.