| Sumario: | Purpose: To investigate whether the CYP3A4/5 and ABC transporter genetic polymorphisms could affect the pharmacokinetics of lenvatinib in Chinese healthy subjects. Methods: Thirty-two healthy Chinese volunteers were enrolled and took oral administration of 8 mg lenvatinib. Plasma concentration of lenvatinib was determined by UPLC-MS/MS, the CYP3A4*1G, CYP3A5*3, ABCB1 (3435 C>T, 1236 C>T, 2677 G>T/A), ABCG2 (421 C>A, 34 G>A), and ABCC2-24 C>T genotypes were determined by SnapShot Technique. Results: In ABCB1 3435T carriers (n = 19), AUC0–120h (815.7 (701.9–923.9) ng·h/mL) and AUC0-∞ (843.3 (722.2–977.7) ng·h/mL) were significantly higher than ABCB1 3435CC homozygous subjects (n = 13, 575.3 (513.7–756.9) ng·h/mL and 590.0 (540.5–782.0) ng·h/mL, respectively); on the contrary, the clearance (CL/F) of ABCB1 3435T carriers was significantly lower (9.5 (8.2–11.1) L/h vs. 13.6 (10.4–14.8) L/h). And the Cmax in CYP3A4*1G/*1G allele carrier subjects was higher than *1 carrier (73.4 ng/mL vs. 53.5 (46.1–60.6) ng/mL), but did not reach the level of significantly statistical difference. Genetic polymorphisms of ABCC2, ABCG2, and CYP3A5 could not influence pharmacokinetic parameters of lenvatinib. Conclusions: This work presented an evidence that the ABCB1 3435 C>T polymorphism could significantly affect the exposure and clearance of lenvatinib. These findings may explain the reasons for the huge inter-individual differences in lenvatinib, and should contribute to clinical individualized treatment.
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