DSG3 and acquired polycythemia vera: Additionally, in some studies, in the follow-up period of patients showing a transition from PV to PF, re-transition to PV has been observed.2, 8 Interestingly, among previously reported patients showing the transition from PV to PF, two of them had elevated levels of both anti-Dsg1 and anti-Dsg3 antibodies after the transition.6, 15 Although subtype conversion among pemphigus patients is extremely rare, the transition from PF to PV is even rarer (Table 2).