ECRG4 may be involved in p53 pathway. Representative photos and statistic plots of relative protein expression levels in EC9706/pcDNA3.1-ECRG4 and EC9706/pcDNA3.1. Analysis of cell's total proteins by Western blot showed that p53 and p53 target gene p21 expressions were increased in EC9706/pcDNA3.1-ECRG4 cells compared with in EC9706/pcDNA3.1 cells (P < 0.05). Lane 1: EC9706/pcDNA3.1-ECRG4; Lane 2: EC9706/pcDNA3.1. *, P < 0.05, compared with EC9706/pcDNA3.1.