DSG1 and acquired polycythemia vera: In multivariate analysis, level of anti-Dsg1 autoantibodies represented an independent risk factor for overall mortality in PV when explored by adding the anti-Dsg1 autoantibodies ≥ 100 U/mL to the initial model adjusted by age as dichotomous (p = 0.029), but not when used as a continuous variable (p > 0.05).