DSG1 and acquired polycythemia vera: Consistent with a previous study by our group performed in a slightly smaller patient cohort (197 PV patients), mean anti-Dsg1 levels significantly decreased from active to complete remission (p < 0.001) to levels below the threshold set by most studies for positivity (i.e. 20 IU/mL), while mean anti-Dsg3 levels decreased significantly from active to complete remission (p < 0.001), but often remained highly elevated even in remission (Supplementary Figure 2).