IL2 and chronic myelogenous leukemia, BCR-ABL1 positive: These data are consistent with the findings by Panteli et al., who demonstrated that serum derived from patients with PMF, ET, PV, and CML (N = 25, N = 40, N = 8, and N = 10 patients, respectively) contained significantly higher IL-2 and sIL-2RA than healthy subjects but similar levels of IL-1α and IL-1β.