However, some cases in the current study (4 AD, 3 PD, and 1 NC) showed a significantly higher expression of GFAP in the superficial white matter (>0.5 positive staining area), in comparison to the other cases (2 AD, 2 PD, and 3 NC) (<0.4 positive staining area). This evidence concerns the gene GFAP and Parkinson disease.