CXCL12 and acquired polycythemia vera: Indeed, positive correlations were found between the levels of 13 molecules (8 cytokines, 3 chemokines, 2 receptors) and blood counts of neutrophils (correlated well in PV with IL-1Rα, and weakly with IL-1β, IP-10, HGF and MIG), monocytes (weak correlation with IP-10 in PV), lymphocytes (weak correlations with IL-4, IL-9, IL-33 and MIP-1β) and platelets (weak correlations with SDF-1α, IL-2Rα, IL-7, IL-9, IL-17 and MIG) (Table 3).