Effect of nicotinamide and carbogen on 5-FU uptake (measured as SUV3 Effect of nicotinamide and carbogen on 5-FU uptake (measured as SUV3.75) in different tissues. Effect of nicotinamide and carbogen on 5-FU uptake (measured as SUV3.75) in different tissues. Data for 14 metastases in six patients. Black columns, without nicotinamide and carbogen; dotted columns, with nicotinamide and carbogen. Measurements were not obtained for all metastases (see Table 1). Nishi Gupta et al. Clin Cancer Res 2006;12:3115-3123 ©2006 by American Association for Cancer Research