VTCN1 and acute myeloid leukemia: More importantly, in silico analysis using data extracted from the curated database Leukemia Gene Atlas (http://www.leukemia-gene-atlas.org) also showed that B7-H4 expression level was positively correlated with the overall survival of AML patients (Supplementary Figure 1b), indicating that B7-H4 may serve as a tumor suppressor during leukemia development.