Medical Oncology includes Chemotherapy, or chemo for short. That means taking certain types of drugs to treat cancer. You might take these drugs before or after cancer surgery. You might take them with radiation (x-ray) treatment. Or you might take chemo alone.
Chemo has been helping people beat cancer since early 1950. The chemo drugs your doctor uses have been tested again and again. Research shows they work. Partly because of chemo, many people with cancer can have full, healthy lives.
You can learn more about chemotherapy from the American Cancer Society