(38) in a sequencing and typing analysis of 11 classical HLA loci using 1597 PD and 1606 controls found strong protective effects of HLA-DRB1*04:01 and HLA-DQB1*03:02, but no significant differences between cases and controls for alleles of any class I locus (HLA-A, -B, and -C) or class II loci HLA-DPA1, -DPB1, -DRB3, -DRB4, and -DRB5. This evidence concerns the gene HLA-DPA1 and Parkinson disease.