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“This reduced folate enhanced the cytotoxicity and the growth inhibitory potency of 5-fluorouracil ( 5-FUra ) and of 5-fluoro-2'-deoxyuridine (FUdR) against all cell lines examined.”
“The lack of sufficient folates in the tumor cell, especially N5,N10-methylene tetrahydrofolate, would thus result in less than optimal cell kill by FUdR and possibly by 5-FU.”