JAK2 and acquired polycythemia vera: A previous genetic analysis of patients with signs of erythrocytosis included only the examination of the JAK2 gene for variants causative for PV, with allele-specific PCR, high-resolution melting (HRM) analysis, and Sanger sequencing (Baxter et al., 2005; Ugo et al., 2010; Geay et al., 2020).