In Indo-AsiansDRB1*14:04 also is associated with PV (Saha et al., 2010).In Japanese, the haplotypes DRB1*14:54(14:01) or14:05-DQA1*01:04-DQB1*05:03 were associated with PV(Yamashina et al.,1998). This evidence concerns the gene HLA-DRB1 and acquired polycythemia vera.