DSG1 and acquired polycythemia vera: Interestingly, in that study, three patients were described as having concomitant features of PV and PF which is a less frequently described phenomenon, five patients showed a transition from PV to PF (two of them were previously reported elsewhere),5 one patient showed the transition from PV (anti-Dsg1-3 positive in ELISA, anti-Dsg3 positive in immunoblot) to PF (anti-Dsg1 positive both in ELISA and immunoblot) and subsequently showed re-transition to PV (anti-Dsg1 positive and anti-Dsg3 positive in ELISA, anti-Dsg3 positive in immunoblot) in one year period. 8