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The pharmacokinetic interaction between irinotecan and sunitinib
Lili Jiang1, Li Wang1, Zhongmin Zhang1
1School of Life and Pharmaceutical Sciences, Dalian University of Technology, 2 Dagong Road, Liaodongwan New District, Panjin, 124221, Liaoning, China.
Sunitinib weakly inhibits irinotecan
Area of Science:
- Pharmacology
- Drug Interactions
- Cancer Therapy
Background:
- Previous trials suggest synergistic antitumor effects of irinotecan and sunitinib.
- The underlying mechanism, particularly pharmacokinetic interactions, requires further investigation.
Purpose of the Study:
- To investigate the pharmacokinetic interaction between sunitinib and irinotecan.
- To determine if sunitinib affects SN-38 glucuronidation, a key metabolic pathway for irinotecan.
Main Methods:
- Assessed sunitinib's inhibitory effects on SN-38 glucuronidation.
- Utilized recombinant human UGT1A1 isoforms and human liver microsomes (HLMs).
- Measured SN38 glucuronide formation rates in the presence and absence of sunitinib.
Main Results:
- Sunitinib demonstrated competitive inhibition of SN-38 glucuronidation by UGT1A1.
- Weak inhibitory effects were observed in pooled HLMs (Ki = 119.00 μM) and recombinant UGT1A1 (Ki = 42.71 μM).
Conclusions:
- The pharmacokinetic interaction between sunitinib and irinotecan via UGT1A1 is likely weak.
- This study provides insights into the synergistic antitumor activity and informs future clinical study designs for this combination therapy.
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