LIN28A and breast cancer: Overexpression of Lin28A and Lin28B is associated with poor prognosis in various cancers, such as oral squamous cell carcinoma (OSCC) [6, 7], colon cancer [8, 9], epithelial ovarian carcinoma (EOC) [4, 10, 11], gastric cancer [12–14], hepatocellular carcinoma (HCC) [15–17], breast cancer [18, 19], esophagus cancer [20], and other malignancies [21–26].