MKI67 and breast cancer: Furthermore, by both immunohistochemistry and qRT-PCR analysis with local samples, the expression of ZSCAN1 was found to be negatively correlated with Ki67 (Figure 1C right, P < 0.001, and Figure 1D right, P < 0.001); Ki67 was found to be elevated in BC tissues versus normal tissues (Figure 1C middle, P < 0.001, and Figure 1D middle, P < 0.001).