CCNA2 and Parkinson disease: We also found other up-regulated antibodies (such as FKBP3, TSPY3, PTGER3, CXCR6, and MLKL) and down-regulated antibodies (such as STUB1, MAP4, STK33, USH1C and CCNA2) among the H. pylori-seropositive patients; however, the roles of these antibodies in PD and H. pylori remain unclear.