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Betulinic acid inhibits proliferation and metastasis in gastric cancer cells tumour. A, Immunohistochemical analysis of Ki‐67 and MMP‐2 of tumour sections from different treated groups. B, Statistical analysis of immunohistochemical results of Ki‐67 and MMP‐2 of tumour sections from different treated groups. Significant differences were indicated as *P ≤ .05; **P ≤ .01; ***P ≤ .001
