Purpose: To explore efficacy of short-course olanzapine with or without low-dose dexamethasone for prevention of delayed emesis in gynecologic cancer patients receiving carboplatin/paclitaxel.
Methods: This was a prospective study in 81 chemo-naive patients receiving 0.25 mg intravenous palonosetron, 16 mg dexamethasone, and 10 mg oral olanzapine before chemotherapy. On days 2 and 3, patients randomly received 10 mg olanzapine (arm A; n=27), 10 mg olanzapine plus 4 mg dexamethasone (arm B; n=27), or 8 mg dexamethasone (reference arm C; n=27). The primary endpoint was total control (TC; no vomiting, no rescue antiemetics, and no nausea) on days 2-5, using a diary. Secondary endpoints included proportion of patients with no emesis impact on daily life using the Functional Living Index-Emesis (FLIE) questionnaire, and patient's satisfaction with antiemetic coverage.
Results: Fifty-two percent of patients in arm A (P=0.406), 59% in arm B (P=0.779), and 67% in arm C had a delayed TC. Secondary analyses showed no significant difference across arms in any efficacy endpoint. FLIE scores as well as mean satisfaction scores were similar across arms.
Conclusions: In this exploratory study with a small sample size, we did not find any clue about better control of delayed emesis with either olanzapine regimen in gynecologic cancer patients treated with carboplatin/paclitaxel and receiving the same prophylaxis for acute emesis.
Keywords: CINV; Carboplatin; emesis; olanzapine; palonosetron.