NPC43 was chosen because among the cell lines tested, both the BTN2A1 gene and protein expression were consistently upregulated; it is a clinically derived NPC cell line with features such as persistence of the EBV episome and viral gene expression, with retained 94% missense, stopgain, splicing, insertions, and deletions (INDELs) between the cell line and the original patient’s NPC [29]. This evidence concerns the gene BTN2A1 and nasopharyngeal carcinoma.