Deleted in leukemia 1 (DLEU1) and 2 (DLEU2) are two lncRNAs whose genes map in a critical region at chromosome 13q14.3 deleted in more than 50% of chronic lymphocytic leukemia (CLL) patients [23], and hosting miR-15a and 16–1, a miRNA tumor suppressive cluster [24]. Here, DLEU1 is linked to B-cell chronic lymphocytic leukemia.