Nausea or vomiting occur in 50 to 70% of people with advanced cancer.[29] 50 to 80% of people undergoing radiotherapy experience nausea and/or vomiting, depending on the site of irradiation.[5] Anticipatory nausea and vomiting is experienced by approximately 20 to 30% of people undergoing chemotherapy.[19] Chemotherapy-induced nausea and vomiting resulting from treatment with highly emetogenic cytotoxic drugs can be prevented or effectively treated in 70 to 80% of affected people.[4][15]