STIL and acute lymphoblastic leukemia: In a previous study, the presence of STIL‐TAL1 fusion in T‐ALL resulted in a significantly inferior overall survival as well as relapse‐free survival.50 Furthermore, in the same study, STIL‐TAL1+ T‐ALL had a significantly shorter time of disease onset in murine models which could explain the younger epigenetic and mitotic age as well as longer telomere length in the CIMP− subgroup.