As revealed with the general linear model, in veterans with PTSD, PANSS cognition subscale scores were significantly associated with BDNF rs56164415 polymorphism (Figure 1), with significant differences found in the PANSS cognitive scores in veterans subdivided into carriers of the rs56164415 genotypes (H = 11.244; df = 2; p = 0.004), alleles (U = 87,785.5; df = 2; p = 0.008) and T carriers vs. CC homozygotes (U = 33,797.5; df = 2; p = 0.002). The gene discussed is BDNF; the disease is post-traumatic stress disorder.