Cancer stem cells are a subpopulation of cells within a tumour that have the ability to self-renew and give rise to all the cell types within a cancerous tissue. Oncology is the study of cancer, including its causes, diagnosis, and treatment. In the field of stem cell research, cancer stem cells and oncology are closely interconnected, as stem cells are thought to play a key role in the development and progression of many types of cancer. Researchers are studying cancer stem cells in order to better understand the underlying mechanisms of cancer and to develop new therapies that target these cells. The insights gained from this research are helping to drive the development of more effective and personalized treatments for cancer patients.