Abstract
Olanzapine combined with the neurokinin-1 receptor antagonist, palonosetron and dexamethasone is the standard treatment for chemotherapy-induced nausea and vomiting (CINV) due to highly emetogenic chemotherapy (HEC). However, the use of olanzapine poses challenges in patients with diabetes mellitus (DM) due to the potential risk of hyperglycemia. ME2136, antipsychotic similar to olanzapine, is associated with a lower risk of hyperglycemia. This study investigated the antiemetic efficacy and safety of ME2136 for HEC. This single-arm phase 2 study examined the safety and efficacy of ME2136 5mg for 4days in combination with triplet-combination antiemetic therapy. Two cohorts were established for the safety assessment: DM and non-DM. Eligible patients had malignant tumors and were receiving cisplatin-based chemotherapy for the first time. The primary endpoint was the complete response (CR) rate, defined as the percentage of patients without vomiting and not requiring rescue medications in the delayed phase (24-120h). Between December 2020 and January 2022, 40 patients were enrolled, with 20 in each cohort. All patients were included in the safety analysis and 35 in the efficacy analysis. The CR rate in the delayed phase was 71.4% [60% CI 63.1-78.6%] for all patients, 66.7% in the DM cohort, and 76.5% in the non-DM cohort. No treatment-related adverse events ≥ grade 3, including hyperglycemia, were reported. ME2136, when combined with standard triplet-combination antiemetic therapy, is expected to exert similar antiemetic effects to the standard treatment for CINV due to HEC. Currently, ME2136-02 trial is underway to examine the safety and efficacy of triplet-combination antiemetic therapy and a 5-day treatment with ME2136. This study was registered with the Japan Registry of Clinical Trials (jRCT2041200071) on 10 December 2020. Clinical trial registration: This study was registered with the Japan Registry of Clinical Trials (jRCT2041200071) on 10 December 2020.
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