Analysis of correlations revealed a positive correlation between VEGF-A concentration and TF Ag (R = 0.27; p = 0.09) (Figure 4) as well as a positive correlation between VEGF-A concentration and TFPI activity in the group of ET patients (R = 0.26; p = 0.01) (Figure 5). The gene discussed is TFPI; the disease is essential thrombocythemia.