FGF20 and Parkinson disease: Moreover, Method 1 detected three SNPs on chromosome region 8p22 (the most significant P = 9.9 × 10-10 at rs2736050), which were only 1.2 Mb apart from a previously reported PD susceptible gene FGF20. FGF20 and SNCA have previously been reported to be synergistically associated with PD [18].