It has been reported that let-7d-5p is downregulated in ovarian cancer tissues and cell lines compared to non-tumoral tissues and cell lines; let-7d-5p downregulates CDK2 expression, arrests the cell cycle at the G0/G1 phase, and improves the chemosensitivity of ovarian cancer cells to cisplatin (Chen et al., 2019[18]). The gene discussed is CDK2; the disease is ovarian carcinoma.