CCR2 and myeloproliferative disorder: This prompted us to ask whether the percentage of CCR2+ cells correlated with the degree of BM fibrosis (MF 0, 0-1, 1 and 2/3) in a broader MPN patient cohort that included compelling disease entities such as, as a matter of fact, ET/PV-F and MPN-u, with or without fibrosis, in addition to prePMF, overtPMF and sMF, for a total of 40 MPN patients.