As shown in table 2 and in figure 4, TF cycle threshold was significantly lower in patients with hypereosinophilia than in healthy subjects, median (range) 35.10 (19.45–36.50) vs 37.17 (35.33–37.87) (p = 0.002), indicating that TF gene expression was higher in hypereosinophilic disorders. This evidence concerns the gene TF and hypereosinophilic syndrome.