A total of 87 genes were highly overexpressed (four-fold and higher compared to HuURNA) in ET, 84 genes in PV, 68 in PMF with JAK2V617F mutation and 42 genes in ET/PMF JAK2V617F negative (Mut0)-derived CD34+ cells, while in granulocytes even higher quantity of overexpressed genes were observed (Table 1). The gene discussed is CD34; the disease is acquired polycythemia vera.