Abstract：
:cis-Diamminedichloroplatinum(II) is an antineoplastic drug that is undergoing a renewed clinical interest as a drug for use in combination regimens. In order to increase the understanding of the pharmacokinetics of this drug, the plasma clearance and organ distribution of platinum were followed in female beagle dogs treated with a single i.v. dose of cis-diamminedichloroplatinum(II). Plasma levels of platinum were determined by flameless atomic absorption spectrometry and showed a distinctly biphasic clearance pattern with a rapid-phase half-time of considerably less than 1 hr and a slow-phase half-time of nearly 5 days. During the first 4 hr after treatment, plasma levels fell by 90% while 60 to 70% of the applied dose was recovered in the urine. Sixteen tissues plus plasma, bile, and urine were routinely analyzed for platinum content. An easily measurable plasma concentration of platinum was still detectable 12 days after treatment, with no significant change in plasma concentration between Days 4 and 12. Initial concentrations of platinum were highest in organs of excretion, gonads, spleen, and adrenals but remained significantly elevated only in kidney, liver, ovary, and uterus, where a tissue: plasma ratio of 3 to 4 was maintained for as long as 6 days posttreatment. The apparent in vitro binding of platinum to dog plasma and to bovine serum albumin was studied by ultrafiltration and increased progressively during 48 hr of incubation at 37 degrees.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Litterst CL,Gram TE,Dedrick RL,Leroy AF,Guarino AMsubject
Has Abstractpub_date
1976-07-01 00:00:00pages
2340-4issue
7 PT 1eissn
0008-5472issn
1538-7445journal_volume
36pub_type
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