ANXA5 and nasopharyngeal carcinoma: The results of Annexin V-FITC/PI double fluorescent staining (Figure 2(a)) showed that, after 48 h of treatment with 10 μM, 20 μM, and 40 μM isoimperatorin, it significantly induced the apoptosis of nasopharyngeal carcinoma cells as compared with the solvent control group (P < 0.01).