Furthermore, a correlation analysis within the PD group revealed no significant correlation between PD severity (measured with UPDRS) and the expression levels of SKP1A (p = 0.455), PSMC4 (p = 0.655), UBE2K (p = 0.305) and HSPA8 (p = 0.786). The gene discussed is HSPA8; the disease is Parkinson disease.