When we validated these results using arrays from the Leukemia-gene Atlas repository (http://www.leukemia-gene-atlas.org/LGAtlas), an in silico analysis of HOTAIRM1 levels in different AML subgroups showed that in other cohorts [26, 27], HOTAIRM1 was also expressed at the lowest levels in APL and at the highest in t(6;9) AML (Supplementary Figure S1a). This evidence concerns the gene HOTAIRM1 and acute promyelocytic leukemia.