As shown in Table 3, within HLA-DQA1* locus, a significantly higher frequency of the HLA-DQA1*03:01 allele (OR=7.76; 95%CI=3.88-15.53; Padj=6.66x10-7) and HLA-DQA1*01:04 allele (OR=4.27; 95%CI=1.79-10.19; Padj=0.01198) were found among PV patients, compared to the control group. Here, HLA-DQA1 is linked to acquired polycythemia vera.