FLT3 and acute lymphoblastic leukemia: Compared with non‐ETP T‐ALL, ETP‐ALL exhibits a higher frequency of myeloid lineage‐associated gene mutations (e.g., FLT3, DNMT3A) but a lower frequency of other T‐ALL‐associated mutations (e.g., NOTCH1, CDKN1/2) [1, 10].