Moreover, we found a positive correlation between allopregnanolone serum levels and the MDS-UPDRS III score in GBA-PD patients (Spearman’s r = 0.39, p = 0.035, Figure 3A), suggesting that the differences found in this NS levels between GBA-PD and NM-PD may result in a different clinical phenotype. Here, GBA1 is linked to Parkinson disease.