title: Systemic and tissue chamber fluid platinum concentrations released from cis-diamminedichloroplatinum II-impregnated polymethylmethacrylate in healthy dogs.
abstract: OBJECTIVE
  To determine systemic and local platinum concentrations released from subcutaneously implanted cis-diamminedichloroplatinum (cisplatin) -impregnated polymethylmethacrylate (PMMA) and to evaluate systemic or local adverse reactions.
  
  
  METHODS
  6 healthy dogs.
  
  
  METHODS
  Cisplatin (20 mg) was inserted into PMMA that was fashioned into cylinders and placed into subcutaneous tissue chambers overlying the thorax (treated site). An empty tissue chamber was placed over the opposite side (control site). Plasma samples were obtained for platinum determination before implantation, at 3, 6, and 12 hours after implantation on day 0, and once daily on days 1, 2, 3, 7, 14, 21, and 29. At similar times on similar days, tissue chamber fluid samples also were obtained for platinum determination. Complete blood count, serum urea nitrogen and creatinine concentration determinations, and urinalyses were performed on days 1, 2, 3, 7, 14, 21, and 29. Complete necropsy was performed at conclusion of the study.
  
  
  RESULTS
  Tissue chamber platinum concentrations at the treated site were significantly greater than plasma and control site tissue chamber concentrations on days 2, 3, 7, 10. Mean plasma platinum concentration at 3 (0.735 microg/ml), 6 (0.691 microg/ml), 12 (0.534 microg/ml), 24 (0.131 microg/ml), 48 (0.2 microg/ml), 72 (0.1 microg/ml), and 158 (0.014 microg/ml) hours was significantly greater than pretreatment values (0.0 microg/ml). Plasma platinum concentration 10 days after treatment (0.011 microg/ml) did not significantly differ from pretreatment values. Local or systemic adverse reactions were not apparent.
  
  
  CONCLUSIONS
  The route of cisplatin administration was safe. Greater concentration of platinum was released locally relative to plasma concentration for an extended period.
authors: Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia 65211, USA.
authors: M S
authors: MS
authors: Buss
authors: C J
authors: CJ
authors: Henry
authors: J W
authors: JW
authors: Tyler
authors: K S
authors: KS
authors: Tobias
authors: S
authors: S
authors: Daoud
authors: J
authors: J
authors: Hoopes
authors: M P
authors: MP
authors: Moore
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D002945:Cisplatin / Q000008:administration & dosage / Q000493:pharmacokinetics*; D003692:Delayed-Action Preparations; D004285:Dogs / Q000378:metabolism*; D005260:Female; D008297:Male; D019904:Polymethyl Methacrylate
chemical_list: D000970:Antineoplastic Agents; D003692:Delayed-Action Preparations; D019904:Polymethyl Methacrylate; D002945:Cisplatin