It's a treatment using drugs that kill cancer cells. These drugs are administered orally or intravenously and then spread throughout the body. Because they are often more effective when multiple drugs are administered simultaneously, they are administered in various combinations. Chemotherapy is administered for a specific period and then paused. During these intervals, the patient is allowed to recover. The medication is then administered again for a period of time, followed by a pause.
In some cases, it may be necessary to add drug therapy in addition to local surgery. Even if postoperative examinations reveal no remaining cancer in any area, drug therapy may be administered for a period of time as a preventative measure.
The specific circumstances, medications, and duration of chemotherapy are generally determined by medical oncologists.