HLA-DPB1 and pulmonary arterial hypertension: The latest additions to this list are an SNP in an enhancer locus near SOX17 (rs10103692) that was associated with PAH, and a variant in HLA-DPA1/DPB1 (rs2856830) that was associated with I/HPAH and showed different survival depending on the genotype (CC vs. TT) (37).