Medical oncology is concerned with the prevention, diagnosis and treatment of cancers. The diagnosis sets the scene for treatment by the oncologists. Chemotherapy, hormonal treatments, immunotherapy or “targeted” cancer therapies are available. The dose, the dosage schedule and the combination of individual agents depend on the patient‘s condition and the nature of their diseases. Medicines for controlling tumours are either administered orally, injected or infused by drip. Drip infusions require either outpatient (lasting a few hours) or hospital treatment (from two to several days’ duration). Chemotherapies can cause unwanted side effects. Research and practice strive to limit these side effects to a minimum.