尿苷
生物利用度
口服
医学
药理学
养生
化学
内科学
胃肠病学
生物化学
核糖核酸
基因
作者
G. J. Van Groeningen,Godefridus J. Peters,Jorge Nadal,E. Laurensse,H. M. Pinedo
标识
DOI:10.1093/jnci/83.6.437
摘要
Effects of Oral administrations of uridine were investigated in a study of six healthy volunteer control subjects and nine patients with metastatic colorectal cancer. Oral uridine was studied as single-dose administrations at dosesescalating from 0.3 to 12 g/m2 and as multiple-dose administrations every 6 hours for 3 days at doses from 5 to 10 g/m2. The maximum tolerated dose (MTD) was 10 to 12 g/m2 for a single dose of uridine and 5 g/m2 for the multiple-dose regimen. Diarrhea was the dose-limiting toxic effect. Single-dose oral uridine resulted in an increase in plasma uridine concentrations in the range of 60 to 80 μM after doses of 8 to 12 g/m2. At these doses, Bioavailability of oral uridine ranged from 5.8% to 9.9%. At the MTD of 5 g/m2 in the multiple-dose uridine schedule, steady-state plasma uridine levels of approximately 50μ were achieved. Further Studies should explore the role of oral uridine in the modulation of the toxicity of fluorouracil. [J Natl Cancer Inst 83:437–441, 1991]
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