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Effect of aprepitant administration on CINV caused by cisplatin multi-day chemotherapy and pharmacokinetics of docetaxel.

PURPOSE: To compare efficacy and safety of postponing administration of aprepitant and routine triple-antiemetic treatment for chemotherapy-induced nausea and vomiting in patients who received docetaxel and cisplatin multi-day chemotherapy treatment, and to evaluate the effect of aprepitant on docetaxel pharmacokinetics in the Chinese population.

METHODS: A total of 24 cancer patients (including 5 females and 19 males, 22-74 years old) received two cycles of high-emetic DP (docetaxel 75 mg/m2  on day 1 + cisplatin 25 mg/m2 on days 1-3) regimen. A randomized, two-period and cross-over study was applied for prevention of chemotherapy-induced nausea and vomiting. The patients in group A took aprepitant 125 mg on day 1 and 80 mg on days 2-3 (administered aprepitant 1 h before chemotherapy). In group B, the patients took aprepitant 125 mg on day 2, 80 mg on days 3-4, which was delayed 1 day than group A. Efficacy and safety in overall phase were evaluated within 5 days after initiation of chemotherapy. Simultaneously, the differences in the pharmacokinetic parameters of docetaxel between two different antiemetic treatments are compared.

RESULTS: The CR rate of delayed-phase nausea was compared between the routine triple-antiemetic treatment (group A) and the aprepitant delayed 1-day administration treatment (group B), and the difference was statistically significant (16.7% vs 45.8% P < 0.05), despite there were similar for two groups in the CR rate of acute-phase nausea and vomiting, and delayed-phase vomiting. In two groups, the area under the docetaxel curve (AUC0-t values) (mean ± SD) of docetaxel was 1134.21 ± 732.55 (ng h/mL) and 1080.94 ± 585.09 (ng h/mL), and the geometric means were 944.82 and 902.10 (ng h/mL), respectively. There was no significant difference in AUC values between the two antiemetic treatments (P > 0.05), as well as Cmax , CLz , T1/2z , MRT and Tmax .

CONCLUSIONS: Delayed administration of aprepitant provided superior delayed-phase nausea protection for patients who received cisplatin-based chemotherapy in comparison with the routine triple-antiemetic treatment. In addition, in the routine triple-antiemetic treatment, aprepitant did not significantly affect the main pharmacokinetic parameters of docetaxel.

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