Twelve Sca1‐Lmo2 leukemias were analyzed and revealed copy number loss of Cdkn2a/b (2/12) and Bcl11b (4/12), similar to human T‐ALL (Diccianni et al, 1997; Gutierrez et al, 2011), as well as c‐Myc amplification (8/12; Fig 3A). This evidence concerns the gene CDKN2A and acute lymphoblastic leukemia.