Ze-Yue Xu1,2, Hong-Li Guo1, Ling Li1,2, Min Zhang3, Xia Jing1, Ze-Jun Xu1, Jin-Chun Qiu1, Xiao-Peng Lu4, Xuan-Sheng Ding2, Feng Chen1, Jing Xu1. 1. Department of Pharmacy, Children's Hospital of Nanjing Medical University, Nanjing, China. 2. School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China. 3. Department of Pharmacy, Boston Medical Center, Boston, MA, United States. 4. Department of Neurology, Children's Hospital of Nanjing Medical University, Nanjing, China.
Abstract
Objective: This study was conducted to evaluate the potential genetic and non-genetic factors contributing to plasma trough concentration-to-dose (C 0/D) ratio of valproic acid (VPA) in pediatric patients with epilepsy. Study Design: A single-center, retrospective cohort study was performed by collecting data from 194 children aged 1-14 years between May 2018 and November 2018. The oral solution (n = 135) group and the sustained-release (SR) tablet group (n = 59) were defined, and the plasma VPA C 0 was measured. Twenty-six single-nucleotide polymorphisms (SNPs) were chosen for genotyping with the MassARRAY system. A multiple logistic regression model was used for data analysis. Results: Body weight (BW) and age were positively correlated with the C 0/D ratio in 194 patients, but the positive correlation disappeared after the patients were divided into oral solution and SR tablet subgroups. The average C 0/D ratio was significantly increased by 2.11-fold (P = 0.000) in children who took VPA SR tablets compared with children who were administered VPA oral solutions. No significant association between genetic variants and the C 0/D ratio was found, even for the five well-studied SNPs, namely UGT2B7 G211T, C802T, C161T, T125C, and CYP2C9 * 3 A1075C. However, a significant association between the C 0/D ratio and UGT1A6/9 Del>A (rs144486213) was observed in the VPA oral solution group, but not in the VPA SR tablet group. Conclusions: The dosage forms of sodium valproate, rather than BW, age, or genetic polymorphisms, significantly affected the VPA C 0/D ratios in pediatric patients with epilepsy. Based on our findings, switching the dosage form between solution and SR tablet should be performed cautiously. Total daily dose adjustment should be considered, and the plasma concentration, seizure-control effect, and adverse drug reaction should also be monitored very closely.
Objective: This study was conducted to evaluate the potential genetic and non-genetic factors contributing to plasma trough concentration-to-dose (C 0/D) ratio of valproic acid (VPA) in pediatric patients with epilepsy. Study Design: A single-center, retrospective cohort study was performed by collecting data from 194 children aged 1-14 years between May 2018 and November 2018. The oral solution (n = 135) group and the sustained-release (SR) tablet group (n = 59) were defined, and the plasma VPA C 0 was measured. Twenty-six single-nucleotide polymorphisms (SNPs) were chosen for genotyping with the MassARRAY system. A multiple logistic regression model was used for data analysis. Results: Body weight (BW) and age were positively correlated with the C 0/D ratio in 194 patients, but the positive correlation disappeared after the patients were divided into oral solution and SR tablet subgroups. The average C 0/D ratio was significantly increased by 2.11-fold (P = 0.000) in children who took VPASR tablets compared with children who were administered VPA oral solutions. No significant association between genetic variants and the C 0/D ratio was found, even for the five well-studied SNPs, namely UGT2B7 G211T, C802T, C161T, T125C, and CYP2C9 * 3 A1075C. However, a significant association between the C 0/D ratio and UGT1A6/9 Del>A (rs144486213) was observed in the VPA oral solution group, but not in the VPASR tablet group. Conclusions: The dosage forms of sodium valproate, rather than BW, age, or genetic polymorphisms, significantly affected the VPA C 0/D ratios in pediatric patients with epilepsy. Based on our findings, switching the dosage form between solution and SR tablet should be performed cautiously. Total daily dose adjustment should be considered, and the plasma concentration, seizure-control effect, and adverse drug reaction should also be monitored very closely.
Authors: Michael D Privitera; Timothy E Welty; Barry E Gidal; Francisco J Diaz; Ron Krebill; Jerzy P Szaflarski; Barbara A Dworetzky; John R Pollard; Edmund J Elder; Wenlei Jiang; Xiaohui Jiang; Michel Berg Journal: Lancet Neurol Date: 2016-02-12 Impact factor: 44.182