However, ZEB1 and ZEB2 RNA levels were reduced 1.9-times (Padj=0.03) and 3.7-times (Padj=0.0006), respectively, in PPB patients, suggesting that expression of other factors important for ZEB transcriptional control might be perturbed (Zhang et al., 2019). This evidence concerns the gene ZEB1 and pleuropulmonary blastoma.