Efficacy of olanzapine as an antiemetic drug for transcatheter arterial chemoembolization for hepatocellular carcinoma.

Although the addition of olanzapine to conventional antiemetic therapy has been reported to be useful for systemic chemotherapy with highly emetogenic agents such as cisplatin, no studies have evaluated its efficacy in transcatheter arterial chemoembolization (TACE) for patients with hepatocellular carcinoma (HCC). We evaluated the antiemetic efficacy of olanzapine in patients with HCC undergoing cisplatin-based TACE. This prospective study included 68 patients with HCC scheduled for cisplatin-based TACE between 2021 and 2022. Patients were divided into two groups: an olanzapine group receiving olanzapine 5 mg plus the conventional triple antiemetic combination and a control group receiving only the conventional triple combination therapy. The incidence of digestive symptoms and adverse events (AEs) in both groups were compared. For TACE-induced nausea and vomiting, the olanzapine group had similar antiemetic complete response (aCR) and complete control (CC) rates at 12 h post-TACE as the control group but significantly higher aCR and CC rates during the delayed-phase after 24 h and better patient satisfaction scores. No significant differences were noted in the occurrence of severe AEs in the two groups. The use of olanzapine, in addition to conventional antiemetics, may be a new standard for patients undergoing cisplatin-based TACE.