No statistical analysis on demographic characteristics between groups was performed; however, participants with MC1R PD were younger at disease onset (61.5 vs. 65.2), more likely to be male (66.8% vs. 60.5%), and more likely to have a history of melanoma (2.25% vs. 0.54%), compared to those with sporadic PD (Table 1). This evidence concerns the gene MC1R and Parkinson disease.