In addition to the proteins that were manifested in the gene set enrichment analysis, NXT1, SAA1, TPD52L2, LUC7L2, CD63, CAAP1, SERF2, MT1F, PCNP, and so on were significantly upregulated, and RTL8C, ELAVL2, CPNE9, ALDH1A1, KCNJ6, and so on were significantly downregulated in PD. The gene discussed is SAA1; the disease is Parkinson disease.