PTSD severity as assessed with the PDS total score in patients was not significantly different between the FKBP5 rs1360780 genotype groups (t = 0.56, p = 0.58) or between the CACNA1C rs1006737 genotype groups (t = 0.34, p = 0.74). This evidence concerns the gene FKBP5 and post-traumatic stress disorder.