So far, many neuropathological studies have been conducted on autopsy samples from PD patients with LRRK2 mutations, including N1437H [18], R1441C [8,14], R1441G [16,20], Y1699C [15], G2019S [97,137–142], and I2020T [17,19]. The gene discussed is LRRK2; the disease is Parkinson disease.