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Purpose: The aim of this study was to investigate the efficacy and safety of prophylactic administration of 5 mg olanzapine (OLZ) combined with neurokinin 1 receptor antagonist (NK 1 RA), 5-hydroxytryptamine type-3 receptor antagonist (5-HT 3 RA), and dexamethasone (DEX) to prevent nausea and vomiting in carboplatin (CBDCA) combination therapy for patients with gynecological cancer., Methods: We conducted a single-arm, multi-institution, phase II study. Gynecological cancer patients scheduled to receive AUC ≥4 mg/mL/min CBDCA were enrolled. All patients received 5 mg OLZ (once daily after supper on days 1-4) combined with NK 1 RA, 5-HT 3 RA, and DEX. The primary end point was complete response (CR; no emesis and rescue therapy) during overall phase (120 h after the start of carboplatin administration)., Results: Between May 2018 and June 2019, 60 patients were enrolled from 3 institutions in Japan. A total of 57 patients who met the criteria were included in the efficacy and safety analysis. The CR rate for the overall phase was 78.9%. Acute (0-24 h) and delayed phases (24-120 h) were 96.5% and 80.7%, respectively. Somnolence was observed in 73.7% patients. However, somnolence of grade 2 or higher was observed in only 3.5% of cases. There were no grade 3 or 4 toxicities associated with OLZ., Conclusions: Preventive use of OLZ combined with standard triplet therapy had promising activity with manageable safety, suggesting that this combination could be an effective standard treatment option for patients with AUC ≥4 mg/mL/min CBDCA combination therapy., Competing Interests: Declaration of competing interest No conflicts of interest to declare., (Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.)

Background: Olanzapine is an inexpensive and durable agent for the treatment of chemotherapy‐induced nausea and vomiting and is also superior to neurokinin‐1 receptor antagonists in the control of nausea. This study aimed to investigate the efficacy and safety of a low dose of 5 mg olanzapine plus granisetron and dexamethasone for treatment of carboplatin (CBDCA)‐induced nausea and vomiting in patients with thoracic malignancies. Materials and Methods: We conducted a prospective, open‐label, single‐arm, multicenter, phase II trial in four centers in Japan. Registered patients were scheduled to receive area under the curve (AUC) ≥5 mg/mL per minute of CBDCA and had never received moderately to highly emetogenic chemotherapy. Patients received olanzapine 5 mg/day orally after supper for 4 days, in combination with granisetron and dexamethasone. Primary endpoint was complete response (CR; no emesis and no use of rescue medication) rate during the overall phase (0–120 hours). Results: Between February 2018 and June 2020, 51 patients were enrolled, and 50 patients were evaluated. The CR rates in the overall (0–120 hours), acute (0–24 hours), and delayed phases (24–120 hours) were 94.0%, 100%, and 94.0%, respectively. No grade 3 or higher adverse effects of olanzapine were observed. Conclusion: Prophylactic antiemetic therapy with a low dose of 5 mg olanzapine plus granisetron and dexamethasone showed durable efficacy with an acceptable safety profile. This three‐drug combination appears to be a reasonable treatment approach in patients with thoracic malignancies receiving an AUC ≥5 mg/mL per minute of CBDCA‐based regimen. Clinical trial identification number: UMIN000031267. Implications for Practice: The results of this phase II trial indicated that the prophylactic administration of low‐dose of 5 mg olanzapine combined with granisetron and dexamethasone has promising activity with acceptable safety profile in patients with thoracic malignancy receiving high‐dose carboplatin chemotherapy. This article reports the results of a study that investigated the efficacy and safety of a three‐drug combination of low dose olanzapine combined with granisetron and dexamethasone in the treatment of chemotherapy‐induced nausea and vomiting in Japanese patients with thoracic malignancies treated with carboplatin. [ABSTRACT FROM AUTHOR]