Why is the development of modern medicine closely related to cytological research?

Modern medicine is closely related to the study of cells. The study of living cells of organisms is engaged in a science called cytology. Based on the knowledge gained, it is possible to determine the actions of various diseases, ways to eliminate them, ways of transferring drugs and their effect on cells. In addition, a big problem that modern medicine is trying to solve is cancer cells. Knowing how to destroy specific cells will help destroy cancerous tumors in various organs and parts of the human body.