Description:
<jats:title>Key Points</jats:title>
<jats:p>Overexpression of RUNX1 and its target NF-E2 is not specific for PV but is also seen in polycythemias due to augmented hypoxia sensing. Elevated levels of RUNX1 and NF-E2 are not specific for primary polycythemias, as these are not present in PFCP.</jats:p>