Silenced lncRNA MSC-AS1 inhibits OS cell in vivo. (A) Tumor volumes in all groups were calculated every 3 days using the formula V=L×W2×0.5. (B) On the 21st day, the tumors were taken out and weighed. (C) Ki67-positive expression of tumors in each group was detected by immunohistochemistry. N=6 in each group, compared with the control group, * p<0.05, ** p<0.01. Two-way ANOVA and Tukey’s multiple comparisons test were applied to determine (A), and one-way ANOVA and Tukey’s multiple comparisons test were applied to determine (B, C). lncRNA – long non-coding RNA; OS – osteosarcoma; ANOVA – analysis of variance.