In contrast, CD68+iNOS+ microglia accounted for 17.6 ± 3.71% and 28.5 ± 3.19% of total CD68+ microglia in the NPC-Astro group and Olig2PC-Astro group, respectively (n = 5 per group, p < 0.001 compared with vehicle, Figure 5O), indicating that the proportion of pro-inflammatory microglia among activated microglia had decreased. This evidence concerns the gene NOS2 and nasopharyngeal carcinoma.