Summary
Aim of the study
mRNA expression of genes involved in the mechanism of action of pemetrexed was correlated with in vitro chemosensitivity of freshly explanted human tumor specimens.
Experimental design
Chemosensitivity to pemetrexed was studied in soft-agar. Multiplex rtPCR experiments for reduced folate carrier (RFC), folate receptor-α (FR-α), folylpolyglutamate synthetase (FPGS), thymidylate synthase (TS), dihydrofolate reductase (DHFR), glycinamide ribonucleotide formyl transferase (GARFT), mrp4, and mrp5 were performed in parallel. Correlations, threshold optimization, sensitivity, specificity, and efficiency were analyzed using the appropriate statistical methodologies.
Results
In 61 samples, low levels of TS, GARFT, DHFR, and mrp4 gene expression significantly correlated with chemosensitivity to pemetrexed. Optimization analyses demonstrated threshold values of 144 copies for TS and six copies for mrp4 relative to 104 copies of β-actin.
Conclusions
These results form a rational basis for the design of clinical trials to evaluate the expression of these enzymes as predictors for treatment outcome.
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Acknowledgement
We are grateful for the financial support of Eli Lilly & Co. Indianapolis, Indiana, USA.
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Axel-Rainer Hanauske and Ulrike Eismann have contributed equally to this project.
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Hanauske, AR., Eismann, U., Oberschmidt, O. et al. In vitro chemosensitivity of freshly explanted tumor cells to pemetrexed is correlated with target gene expression. Invest New Drugs 25, 417–423 (2007). https://doi.org/10.1007/s10637-007-9060-9
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DOI: https://doi.org/10.1007/s10637-007-9060-9