Some notable allelic differences between PD and HC at the p<0.05 level are HLA-B*40:02:01, -DRB1*11:02:01 and -DPA1*02:02:02 with relatively high OR levels (3.68, 4.38 and 2, respectively) and -DRB1*04:02:01, -DRB1*04:04:01, -DQA1*03:01:01, -DQB1*03:02:01, -DPA1*01:03:01 and -DPB1*16:01:01 with relatively low OR levels (0.64, 0.56, 0.68, 0.72, 0.82, and 0.17). This evidence concerns the gene HLA-DRB1 and Parkinson disease.