Scientific Publications by FDA Staff

Cancer Chemother Pharmacol 2014 Oct;74(4):831-8

Pharmacokinetics and pharmacogenomics of daunorubicin in children: a report from the Children's Oncology Group.

Thompson P, Wheeler HE, Delaney SM, Lorier R, Broeckel U, Devidas M, Reaman GH, Scorsone K, Sung L, Dolan ME, Berg SL

PURPOSE: We explored the impact of obesity, body composition, and genetic polymorphisms on the pharmacokinetics (PK) of daunorubicin in children with cancer. PATIENTS AND METHODS: Patients 95 % for age or as body fat >30 %. NONMEM was used to perform PK model fitting. The Affymetrix DMET chip was used for genotyping. The impact of genetic polymorphisms was investigated using SNP/haplotype association analysis with estimated individual PK parameters. RESULTS: A total of 107 subjects were enrolled, 98 patients had PK sampling, and 50 patients underwent DNA analysis. Population estimates for daunorubicin clearance and volume of distribution were 116 L/m(2)/h +/- 14 % and 68.1 L/m(2) +/- 24 %, respectively. Apparent daunorubicinol clearance and volume of distribution were 26.8 L/m(2)/h +/- 5.6 % and 232 L/m(2) +/- 10 %, respectively. No effect of body composition or obesity was observed on PK. Forty-four genes with variant haplotypes were tested for association with PK. FMO3-H1/H3 genotype was associated with lower daunorubicin clearance than FMO3-H1/H1, p = 0.00829. GSTP1*B/*B genotype was also associated with lower daunorubicin clearance compared to GSTP1*A/*A, p = 0.0347. However, neither of these associations was significant after adjusting for multiple testing by either Bonferroni or false discovery rate correction. CONCLUSIONS: We did not detect an effect of body composition or obesity on daunorubicin PK. We found suggestive associations between FMO3 and GSTP1 haplotypes with daunorubicin PK that could potentially affect efficacy and toxicity.