Dividing tumor and normal cells

Dividing tumor and normal cells refers to a physiological state of active cell proliferation rather than a specific molecular entity or receptor. In oncology, this state is the primary focus of traditional cytotoxic chemotherapy, which targets the machinery required for DNA replication and mitosis [American Cancer Society, 2023]. Because these drugs generally cannot distinguish between the rapid division of malignant cells and the necessary division of healthy tissues—such as those in the bone marrow, digestive tract, and hair follicles—they often cause significant systemic side effects [National Cancer Institute, 2024]. Common biomarkers used to identify cells in this state include Ki-67 and PCNA, which are expressed during the active phases of the cell cycle [Li et al., 2016, PubMed]. Modern therapeutic strategies aim to move beyond this broad approach by targeting specific genetic mutations or surface antigens unique to cancer cells to minimize damage to normal dividing cells.

Other names

Proliferating cellsCycling cellsMitotic cellsActively dividing cells

Cytotoxic agents disrupt DNA replication or mitotic spindle assembly, leading to apoptosis in cells undergoing active division [National Cancer Institute, 2024].