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Lenvatinib Case Study

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Lenvatinib is an oral multikinase inhibitor of vascular endothelial growth factor receptor 1–3, fibroblast growth factor receptor 1–4, platelet-derived growth factor receptor α, ret proto-oncogene, and v-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene homolog signaling pathways.1-4 The targeting of multiple angiogenic pathways may circumvent compensatory mechanisms that are upregulated when only a single angiogenic pathway is inhibited.5 Lenvatinib has been extensively evaluated in phase 1 studies in both healthy subjects and in patients with solid tumors,6, 7 as well as in phase 2 studies in patients with various types of thyroid cancer (Eisai data on file).8
Lenvatinib has been approved in the United States, Japan, and Europe for the …show more content…

The population mean value for lenvatinib CL/F was estimated to be 6.56 L/h (% CV 25.5), which was independent of dose (3.2 mg to 32 mg) and time. The capsule formulation had a 10.4% lower bioavailability relative to the tablet formulation. The final population PK model also included significant effects of body weight, population (healthy vs patients with cancer), liver-function markers (ALP and albumin), and concomitant administration of CYP3A4 inducers and inhibitors on lenvatinib CL/F (Table 2). Lenvatinib CL/F increased with increasing body weight (power function = 0.75). Body weight was added as an allometric constant on CL/F and volume parameters and showed a statistically significant effect but only explained 2.8% of the IIV on CL/F. Healthy subjects had a 15% higher lenvatinib CL/F than patients with cancer, lenvatinib CL/F decreased by 11.7% with ALP > the upper limit of normal and decreased by 16.3% with albumin levels < 30 g/L, concomitant administration of CYP3A4 inducers increased lenvatinib CL/F by 30%, and CYP3A4 inhibitors decreased lenvatinib CL/F by 7.8%. Conversely, sex, race, age, ECOG PS, renal-function markers (creatinine clearance and CTC grades for renal function), liver-function markers (ALT, AST, bilirubin, and CTC grades for liver function), and thyroid-function marker (TSH) had no significant effect on lenvatinib CL/F (Table 2). Additionally, drugs that raise gastric pH …show more content…

Based on sampling schemes, plots were separated by phase 1 clinical pharmacology studies in healthy subjects, phase 1 studies in patients with solid tumors, and phase 2 and 3 studies in patients with thyroid cancer. The median (red line) and 5th and 95th percentiles (90% PI, grey area) of these prediction-corrected simulated concentrations were calculated and plotted with prediction-corrected observed lenvatinib concentration data. More than 90% of the observed lenvatinib concentrations were within the 90% PI corroborating performance of the final model. There was a slight misfit at low concentrations during the absorption phase. This was expected as lag time could not be estimated using pooled data from 15 studies with varying sampling schemes during the first hour postabsorption. The results of the bootstrap method are presented in Table 2. As shown, the CIs are generally narrow and the median values of the distribution of bootstrapped parameter values are also consistent with the original parameter

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