Abstract
Purpose
To investigate the pharmacological effects of different erlotinib (ER) and gemcitabine (GM) combination schedules by in vitro and in vivo experiments and PK/PD models in non-small cell lung cancer cells.
Methods
H1299 cells were exposed to different ER combined with GM schedules. Cell growth inhibition was analyzed to evaluate these schedules. A preclinical in vivo study was then conducted to compare tumor suppression effects of different schedules in H1299 xenografts. PK/PD models were developed to quantify the anti-tumor interaction of ER and GM.
Results
Synergism was observed when ER preceded GM, but other sequences showed antagonism. The optimal in vitro schedule, or interval schedule, was applied to the animal study, which showed greater anti-tumor effect than simultaneous group. PK/PD models implied that interaction of the two drugs was additive in simultaneous treatment but synergistic in interval schedule. The simulation results showed that interval schedule can delay tumor growth for a longer time, and demonstrated more evident anti-tumor effect compared with simultaneous group if the treatment duration was longer.
Conclusions
Interval schedule of the two drugs can achieve synergistic anti-tumor effect, and is superior to simultaneous treatment.
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Abbreviations
- EGFR:
-
epidermal growth factor receptor
- ER:
-
erlotinib
- FDA:
-
Food and Drug Administration
- FOCE:
-
first order conditional estimation
- GM:
-
gemcitabine
- MTD:
-
maximum tolerated dose
- NSCLC:
-
non-small-cell lung cancer
- OD:
-
optical density
- PBS:
-
phosphate buffered saline
- PK/PD:
-
pharmacokinetic/pharmacodynamic
- SRB:
-
sulforhodamine B
- TKI:
-
tyrosine kinase inhibitor
- VPC:
-
visual predictive check
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Acknowledgments and Disclosures
This work was supported by the Ministry of Science and Technology of the People’s Republic of China Grant 2009ZX09301-010 and National Natural Science Foundation of China (NSFC) Grant 81273583.
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Li, M., Li, H., Cheng, X. et al. Preclinical Pharmacokinetic/Pharmacodynamic Models to Predict Schedule-Dependent Interaction Between Erlotinib and Gemcitabine. Pharm Res 30, 1400–1408 (2013). https://doi.org/10.1007/s11095-013-0978-7
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DOI: https://doi.org/10.1007/s11095-013-0978-7