tumor(s) – n. a mass of tissue found in or on the body that is made up of abnormal cells

immune system – n. the system that protects your body from diseases and infections

alter(ing) – v. to change something

intravenous – adj. entering the body through a vein

bloodstream – n. the flow of blood that moves through the heart and body

notorious – adj. well-known or famous especially for something bad

blood count(s) – n. the number of cells in someone's blood

approach – n. a way of doing or thinking about something