However, Liu and colleagues showed that IFNγ signaling resulted in IDO1/AhR‐dependent p27 induction when IDO1 and AhR were highly expressed in tumor‐repopulating cells (TRCs).48 The p27 in turn bound to cytosolic pSTAT1, which prevented STAT1‐mediated tumor cell apoptosis. This evidence concerns the gene STAT1 and neoplasm.