Abstract：
:The disposition of 5-[4-14C]azacytidine, administered i.v. as a bolus or continuous infusion, was studied in cancer patients. After bolus, plasma 14C levels exhibited as multiphasic disappearance pattern; half-life (t1/2, beta phase) = 3.4 to 6.2 hr. Of 14C in plasma, less than 2% was associated with 5-[4-14C]azacytidine 30 min after dose. The ratios of 14C levels were: red cells/plasma, approximately 0.8; leukocytes/plasma, 1.1 to 2.3; nucleic acids/leukocytes, 0.2 to 0.43; sputum/plasma, 0.05 to 0.17. Urinary excretion (3 days) accounted for 73 to 98% of 14C, LEss than 1% in feces. The relative concentration of 5-azacytidine in plasma with continuous infusion stayed higher than with bolus; urinary excretion was similar. Fewer side effects were observed with continuous infusion than with bolus. The stability of 5-azacytidine was determined in various media at several temperatures by thin layer chromatography and nuclear magnetic resonance. At 20 degrees in Ringer's lactate (pH 6.2), the t1/2 was 94 to 100 hr. Stability increased with lowering of temperature and pH. From our data we conclude that 5-azacytidine should be given by continuous infusion rather than as a bolus.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Israili ZH,Vogler WR,Mingioli ES,Pirkle JL,Smithwick RW,Goldstein JHsubject
Has Abstractpub_date
1976-04-01 00:00:00pages
1453-61issue
4eissn
0008-5472issn
1538-7445journal_volume
36pub_type
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