Population pharmacokinetic analysis of TQ-B3203 following intravenous administration of TQ-B3203 liposome injection in Chinese patients with advanced solid tumors

Xiaoqing Li; Yunhai Bo; Han Yin; Xiaohong Liu; Xu Li; Fen Yang

doi:10.3389/fphar.2023.1102244

Population pharmacokinetic analysis of TQ-B3203 following intravenous administration of TQ-B3203 liposome injection in Chinese patients with advanced solid tumors

Front Pharmacol. 2023 Jan 16:14:1102244. doi: 10.3389/fphar.2023.1102244. eCollection 2023.

Authors

Xiaoqing Li¹, Yunhai Bo¹, Han Yin¹, Xiaohong Liu¹, Xu Li², Fen Yang¹

Affiliations

¹ Key laboratory of Carcinogenesis and Translational Research (Ministry of Education), National drug clinical trial center, Peking University Cancer Hospital & Institute, Beijing, China.
² Chia Tai Tianqing Pharmaceutical Group Co Ltd, Nanjing, Jiangsu, China.

Abstract

Background: TQ-B3203 is a novel topoisomerase I inhibitor currently in development for the treatment of advanced solid tumors. Great differences in pharmacokinetic characteristics were found among individuals according to the phase I clinical trial following intravenous administration of TQ-B3203 liposome injection (TLI) in Chinese patients with advanced solid tumors. Thus, it is significant to establish a population pharmacokinetic model to find the key factors and recognize their effect on pharmacokinetic parameters in order to guide individualized administration. Methods: Non-linear mixed effect models were developed using the plasma concentrations obtained from the phase I clinical trial by implementing the Phoenix NLME program. Covariates that may be related to pharmacokinetics were screened using stepwise methods. The final model was validated by goodness-of-fit plots, visual predictive check, non-parametric bootstrap and a test of normalized prediction distribution errors. Results: A three-compartment model with first-order elimination was selected as the best structural model to describe TQ-B3203 disposition adequately. Direct bilirubin (DBIL) and body mass index (BMI) were the two most influential factors on clearance, while lean body weight (LBW) was considered to affect the apparent distribution volume of the central compartment. The population estimations of clearance and central volume were typical at 3.97 L/h and 4.81 L, respectively. Model-based simulations indicated that LBW had a great impact on C_max, BMI exerted a considerable influence on AUC_0-t, and the significance of DBIL on both AUC_0-t and C_max was similarly excellent. Conclusion: The first robust population pharmacokinetic model of TQ-B3203 was successfully generated following intravenous administration of TLI in Chinese patients with advanced solid tumors. BMI, LBW and DBIL were significant covariates that affected the pharmacokinetics of TQ-B3203. This model could provide references for the dose regimen in the future study of TLI.

Keywords: TQ-B3203; camptothecin; model application; model validation; population pharmacokinetic model.

Grants and funding

This work was supported by National Natural Science Foundation of China (Nos. 82073817 and 81602655) and Science Foundation of Peking University Cancer Hospital (No.2021-3).