EZH2 and neoplasm: High EZH2 expression and high tumour grade were identified as significantly poorer prognostic factors for OS with a higher mortality risk (hazard ratio 6.992, 95% confidence interval 1.317–37.118, p = 0.022 and hazard ratio 24.863, 95% confidence interval 3.227–191.544, p = 0.002, respectively) (Table 4).