Polo-like kinase 1 (PLK1) is a critical mediator of the cell cycle, regulating mitotic progression. Specific functions of PLK1 during mitosis include chromosome segregation, centrosome maturation, bipolar spindle formation, regulation of the anaphase-promoting complex/cyclosome (APC/C), coordination of cytokinesis, and regulation of the DNA damage checkpoint.[1–3] This serine/threonine kinase also plays an essential role in mitotic entry ...