CD4 and nasopharyngeal carcinoma: The percentage of CD4+CD25+Foxp3+ Tregs after cocultured with NPC cells: 5‐8F/EBNA1 (9.47 ± 1.43%), 5‐8F/NC (4.70 ± 0.53%), 5‐8F (4.63 ± 0.70%), CNE1/EBNA1 (7.30 ± 1.11%), CNE1/NC (4.57 ± 0.85%), and CNE1 (4.27 ± 1.07%) (Figure 3D).