As previously reported, ETP‐ALL exhibits an earlier differentiation stage and greater proximity to hematopoietic stem/progenitor cells compared with non‐ETP T‐ALL; consequently, a high BCL2/BCL2L1 ratio is observed in ETP‐ALL but not in non‐ETP T‐ALL [16]. The gene discussed is BCL2L1; the disease is acute lymphoblastic leukemia.