We further confirmed that the PDX remained the undifferentiated NPC type (similar to the original tumor) by hematoxylin and eosin (H&E) staining, and the continued presence of EBV was revealed by EBER in situ hybridization (ISH) and immunohistochemical (IHC) staining using LMP1 and LMP2A antibodies across different passages. The gene discussed is PDLIM7; the disease is nasopharyngeal carcinoma.