Survival data comparisons in Mayo Clinic patients with PV vs JAK2- or CALR-mutated ET or PMF.P values were <.01 for (1) JAK2-mutated PMF vs CALR-mutated PMF, PV, JAK2-mutated ET or CALR-mutated ET, (2) CALR-mutated PMF vs CALR-mutated ET or JAK2-mutated ET, and (3) PV vs JAK2-mutated or CALR-mutated ET. Univariate analysis did not show a difference between JAK2 and CALR-mutated ET (P = .28) or CALR-mutated PMF and PV (P = .54).