Survival (overall, progression-free (PFS), and event-free (EFS)) according to the follow-up of the absolute numbers of eosinophils. Not stable in time means that an increase (from normal range to eosinophilia, or from eosinophilia to hypereosinophilia), a decrease, or mixed pattern was observed. For the definition of PFS, patients in the MIS group and patients with mast cell leukemia were not included. Note that for PFS, the Y-axis is cut at 40%. The p value refers to the comparison of the survival curves as assessed by log rank test