DSG1 and acquired polycythemia vera: In order to analyze whether ethnicity plays a role in a patient’s fidelity to the postulates of the DCH we sub-grouped all active PV subjects by ethnicity and determined the combination of disease phenotypes and anti-Dsg levels that conformed with the DCH (n=75, 20 IU/mL cutoff) to those that did not (n=84, 20 IU/mL cutoff).