Cyclin-dependent kinases (CDK) are serine/threonine kinases that act as regulatory enzymes involved in cell proliferation. The dysregulation of CDK activity occurs through overexpression of cyclin E1, a binding partner of CDK2, which is observed in several cancers such as high-grade serous ovarian cancer (HGSOC), bladder cancer, gastric cancer and estrogen receptor-positive breast cancer, among others. Selective inhibition of CDK2 may thus be considered a therapeutic approach to regaining cell cycle control.