The stable transfectant, T24T (RhoGDIβ‐GFP), and its vector control transfectant, T24T(Vector), were established and the ectopic expression of RhoGDIβ was validated by western blot, as shown in Fig. 1A. Since our published studies indicate that MMP‐2 is critical for human BC invasion (Jin et al., 2015), we then evaluated the effect of RhoGDIβ overexpression on MMP‐2 expression. This evidence concerns the gene MMP2 and breast cancer.