It was manifested in the results of EdU staining (Figure 3(a)) at 14 d; the NPC cell proliferation rate was raised evidently in the overexpression group (∗p < 0.05), but it was reduced in the siRNA group (#p < 0.05) in comparison with that in the control group (Figure 3(b)), indicating that siRNA S100A8/S100A9 can suppress the proliferation of NPC cells. The gene discussed is S100A9; the disease is nasopharyngeal carcinoma.