PGD and hepatocellular carcinoma: According to the results of the meta-analysis based on 848 HCC patients from the above three databases, the pooled HR and 95% CI of the relationship between PGD expression and OS were 0.49(0.24–0.73), and there was no significant heterogeneity between the three databases (I2 = 20.9%, P = 0.282, Figure 3E).