Using this approach, Dey-Rao et al. have discovered subsets of disease-promoting and disease-preventing genes in a study of 21 PV patients (32) while Sezin et al. identified shared gene signatures between PV and SLE and discovered a possible involvement of the gene GP9 in PV, which encodes a glycoprotein related to platelet adhesion (33). This evidence concerns the gene GP9 and acquired polycythemia vera.