Moreover, the body weights on day 15 after tumor cell injection in the cisplatin plus miR-9 mimic group were statistically significantly lower than that of the other three groups (Figure 3C), and the tumor weight was also reduced in cisplatin plus miR-9 mimic groups (Figure S1). Ki-67 staining showed significantly decreased tumor cell proliferation rates in the cisplatin plus miR-9 mimic group compared to the other three groups (Figure 3D); TUNEL examination showed higher tumor cell apoptosis in the cisplatin plus miR-9 mimic group (Figure 3E). The gene discussed is MKI67; the disease is neoplasm.