In contrast, in non-smokers with PTSD, there were no significant differences in ROCF immediate recall scores between carriers of different BDNF rs56164415 genotypes (H = 0.989; df = 2; p = 0.610), T vs. CC genotype carriers (U = 33.5; p = 0.390) and T and C alleles (U = 85.0; p = 0.232). This evidence concerns the gene BDNF and post-traumatic stress disorder.