OR with 95% CI of developing MS for subjects with different combinations of DRB1*1501, A*0201, and EBNA-1 status compared to subjects with low anti-EBNA-1 antibody levels without the genetic risk factors, overall and stratified by IM status (relative access proportion due to interaction, RERI). The gene discussed is HLA-DRB1; the disease is myeloid sarcoma.