In ET patients, JAK2 V617F allele burden was correlated with platelet counts (r = 0.369, p = 0.000) and WBC counts (r = 0.424, p = 0.000), other than RBC counts (r = 0.061, p = 0.530); In contrast, JAK2 V617F allele burden in PV patients was correlated with WBC counts (r = 0.361, p = 0.007) and RBC counts (r = 0.330, p = 0.014), other than PLT counts (r = 0.111, p = 0.418). Here, JAK2 is linked to acquired polycythemia vera.