In the xenografts formed from cells with PPDPF knockdown, the IHC results showed that the expression of BABAM2 and Bcl-xl was downregulated and that cleaved Caspase3 was upregulated (Figure 7D-E), further demonstrating that downregulation of PPDPF inhibited the tumorigenesis of lung cancer cells in vivo. The gene discussed is BCL2L1; the disease is lung cancer.