A multicenter, randomized, open label, two formulation, crossover bioequivalence trial of doxorubicin hydrochloride liposomal injection in Chinese patients with metastatic breast cancer

PurposeThe primary objectives of this trial were aimed at exploring the pharmacokinetic profiles and the human bioequivalence of an intravenous liposomal injection of doxorubicin hydrochloride in comparison with a reference formulation in Chinese patients diagnosed with metastatic breast cancer.MethodsTo achieve these goals, the trial employed a randomized, open-label, two-formulation crossover dosing strategy among Chinese patients with metastatic breast cancer. Pharmacokinetic (PK) evaluation was conducted through the collection of blood samples, and the liquid chromatography tandem mass spectrometry (LC/MS/MS) method was leveraged to quantify plasma concentrations of both liposome-encapsulated doxorubicin and non-encapsulated doxorubicin in patients. Throughout the trial, all adverse events observed in the patients were meticulously assessed.ResultsThe results indicated that the maximum concentration (Cmax), AUC from time zero to the last measurable concentration (AUC0-t), and AUC extrapolated to infinity (AUC0-infinity) of in vivo non-encapsulated doxorubicin after administration of both formulations fell within the 80.00%-125.00% range at a 90% confidence interval.ConclusionThese findings strongly indicated that the tested formulations were bioequivalent to the reference formulation. The results also demonstrated that both formulations were well-tolerated, further establishing their safety profile in the context of metastatic breast cancer treatment.Trial registrationChinadrugtrials.org.cn Identifier: CTR20200878.