No significant differences were observed in the age at onset, disease duration, Hoehn & Yahr (HY) scale, Unified Parkinson’s Disease Rating Scale (UPDRS), mini-mental state examination (MMSE), Odor Stick Identification Test for Japanese (OSIT-J), and levodopa-equivalent daily dose (LEDD) between the PD/APP+ and PD/APP− groups (Table 1). The gene discussed is APP; the disease is Parkinson disease.