In contrast, there was no difference between TBI patients with vs. without dementia in terms of PDE2A (−dementia, 0.95 ± 0.04; +dementia 0.90 ± 0.03), PDE5A (−dementia, 0.96 ± 0.02; +dementia, 0.97 ± 0.03), or PDE10A expression (−dementia, 0.83 ± 0.03; +dementia 0.86 ± 0.04). This evidence concerns the gene PDE2A and dementia.