CHEK1 and leukemia: The web-based public database Oncomine [22] (https://www.oncomine.org/) was queried for Chk1/2 expression in the available leukemia datasets based on the comparison leukemia versus normal using a criterion of a twofold change for both Chk1 and Chk2 expressions and a p value of 1 × 10−4.