Opposite to those observations, this study provided evidences showing that TIP-1 is a novel interacting protein of LZAP in glioma cells, the presence of TIP-1 enhanced the protein interaction between LZAP and ARF, promoted the polyubiquitination of p53 and resulted in a reduced p53 protein accumulation after irradiation. This evidence concerns the gene CDKN2A and glioma.