PTEN and acute lymphoblastic leukemia: Unlike other studies, DNMT3A mutation was mutually exclusive to NOTCH1 mutation in this cohort.41TP53 mutation was rare in this study (2/27, 7%) which is similar to the frequencies identified in previous studies with much larger cohort of adult T‐ALL patients (between 5% and 11%).42, 43 We did not observe any alterations in the FBXW7 and PTEN genes.