For instance, it is evident that the MCM2 expression correlates with the malignant status and regulates the proliferation and cell cycle of lung squamous cell carcinoma [9], renal cell carcinoma [10], prostate cancer [11], breast cancers [12], brain tumors [13], lymphoma [14], and gastrointestinal tumors [15, 16]. This evidence concerns the gene MCM2 and breast cancer.