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• W2163676191 abstract "Abstract Purpose: To examine whether carbogen and nicotinamide increases 5-fluorouracil (5-FU) delivery to colorectal cancer metastases. Experimental Design: Six patients were scanned using positron emission tomography. Two scans were done to coincide with the start of separate chemotherapy cycles. At the second positron emission tomography session, 60 mg/kg nicotinamide was given orally 2 to 3 hours before 10-minute carbogen inhalation. In the middle of carbogen treatment, [15O]H2O (to measure regional tissue perfusion) and then [18F]5-FU (to measure 5-FU tissue pharmacokinetics) were administered. Results: Regions of interest were drawn in 12 liver metastases, 6 spleens, 6 livers, and 12 kidneys. Nicotinamide and carbogen administration increased mean blood pO2 from 93 mm Hg (95% confidence interval, 79-198) to 278 mm Hg (95% confidence interval, 241-316; P = 0.031). Regional perfusion (mLblood/min/mLtissue) increased in metastases (mean change = 52%, range −32% to +261%, P = 0.024), but decreased in kidney (mean change = −42%, range −82% to −11%, P = 0.0005) and liver (mean change = −34%, range −43% to −26%, P = 0.031). 5-FU uptake at 3.75 minutes (m2/mL) increased in tumor (mean change = 40%, range −39% to +196%, P = 0.06) and decreased in kidney (mean change = −25%, range −71% to 12%, P = 0.043). 5-FU delivery measured as K1 increased in tumor (mean change = 74%, range −23% to +293%, P = 0.0039). No differences were seen in [18F]5-FU tumor exposure (net area under curve) and retention. Conclusion: Nicotinamide and carbogen administration can increase 5-FU delivery to colorectal cancer liver metastases. Despite an increase in perfusion and 5-FU delivery, the effects were not directly related and did not increase 5-FU retention or tissue exposure." @default.
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• W2163676191 date "2006-05-15" @default.
• W2163676191 modified "2023-10-13" @default.
• W2163676191 title "Carbogen and Nicotinamide Increase Blood Flow and 5-Fluorouracil Delivery but not 5-Fluorouracil Retention in Colorectal Cancer Metastases in Patients" @default.
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• W2163676191 doi "https://doi.org/10.1158/1078-0432.ccr-05-0513" @default.
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