MMP‐2 and MMP‐9, also known as gelatinases, were highly expressed in breast cancer and play an essential role in metastasis and invasion.7, 12, 13 In this study, the expression and activity of the two MMPs were evaluated by western blot assay and gelatin zymography, respectively, to probe the mechanism of antimetastasis. Here, MMP9 is linked to breast carcinoma.