Supplementary Table S3 shows that these two genes share nine trans‐pQTL regions containing genes—PTPN22, GCKR, IL18R1, STAT4, CCR1, IFNG‐AS1, PTPN11, PTPN2, and TYK2—previously identified as associated with rheumatoid arthritis. Here, IL18R1 is linked to rheumatoid arthritis.