In breast cancer, miR-671-5p is a tumor-suppressor miRNA in breast tumorigenesis and works by repressing Forkhead Box M1 (FOXM1), which is an oncogenic transcription factor, and causes epithelial-to-mesenchymal transition (EMT) in MDA-MB-231 breast cancer cells (Tan et al., 2016). The gene discussed is FOXM1; the disease is breast cancer.