PTEN and leukemia: PTEN expression is regulated by many transcription factors such as the zinc‐finger transcription factor sal‐like protein 416 and the transacting EMT transcription factor SNAIL (also known as SNAI1)17 as well as microRNAs such as miR‐19 in Cowden and leukaemia disease,18, 19 the miR‐17‐92 cluster in lymphoproliferative disease,20 miR‐21 in multiple cancers and metabolic and inflammatory diseases.21, 22