EZH2 and neoplasm: It was found that compared with nude mice injected with A549 cells transduced with oe‐NC, tumour weight and volume were increased in nude mice injected with A549 cells transduced with oe‐EZH2, while compared with nude mice injected with A549 cells transduced with oe‐EZH2, tumour weight and volume were decreased in nude mice injected with A549 cells transduced with oe‐EZH2 and exo‐NC.