Nude mice with successful tumour formation were randomly divided into four groups, with six mice in each group: the control group (injection medium), the T cell group (injection of common T cells), the empty vector group (injection of T cells transfected with empty vector) and the EpCAM-CAR-T group (injection of T cells transfected with EpCAM-CAR). The gene discussed is EPCAM; the disease is neoplasm.