DSG1 and acquired polycythemia vera: There was no significant correlation between nail involvement and anti-DSG1/DSG3 antibody titers in patients with pemphigus (r = 0.14, p = 0.22; r = 0.09, p = 0.44, respectively), PV (r = 0.16, p = 0.24; r = 0.17, p = 0.23, respectively), or PF (r = 0.07, p = 0.73; r = −0.128, p = 0.53, respectively).