Statistical analysis of PDCD4 expression in 52 EEC tissues and 70 control endometrial tissues. In the control group, the staining index of PDCD4 in the proliferative phase (n=36) was significantly increased compared with that in the secretory phase (n=34). The immunostaining of PDCD4 in G2/3 EEC tissues was lower than that in the proliferative phase of control endometrium. Compared with G1 EEC tissues, PDCD4 expression was downregulated in G2/3 EEC tissues or the secretory phase of control endometrium. **P<0.01, ***P<0.001 vs. control. PDCD4, programmed cell death 4; EEC, endometrioid endometrial carcinomas.