In a meta-analysis focusing on cognitive and psychiatric features, dementia was relatively rare in LRRK2-PD compared to other monogenic forms of PD with the exception of Parkin [15] (58.8 % PINK1, 53.9 % SNCA, 50 % DJ1, 29.2 % VPS35, 15.7 % LRRK2 and 7.4 % Parkin). The gene discussed is SNCA; the disease is Parkinson disease.