PIM1 and acute lymphoblastic leukemia: We found that the expression of H19 is significantly higher in the T‐ALL cell lines with high levels of PIM1 kinase and sensitivity to PIM‐i (HSB‐2, DU.528, and KOPT‐K1) as compared to those with low PIM1 levels and insensitivity to these kinase inhibitors (CUTLL1, HPB‐ALL, and SUP‐T1).