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J Thorac Cardiovasc Surg 2006;131:697-703
© 2006 The American Association for Thoracic Surgery
General Thoracic Surgery |
a Division of Thoracic Surgery, University Hospital, Zurich, Switzerland
b Institute of Clinical Chemistry, University Hospital, Zurich, Switzerland
d Department of Radiation Oncology, University Hospital, Zurich, Switzerland
e Institute of Clinical Pathology, University Hospital, Zurich, Switzerland
f Institute of Biostatistics, University Hospital, Zurich, Switzerland
g Division of Oncology, University Hospital, Zurich, Switzerland
c Laboratory of Inorganic Chemistry, ETH, Zurich, Switzerland
Received for publication June 2, 2005; revisions received August 5, 2005; accepted for publication August 17, 2005. * Address for reprints: D. Lardinois, MD, Division of Thoracic Surgery, University Hospital, Raemistrasse 100, 8091 Zurich, Switzerland. (Email: didier.lardinois{at}usz.ch).
OBJECTIVE: We sought to investigate whether intrapleural topical application of cisplatin with a surgical carrier has a prolonged local tissue level in comparison with cisplatin solution while reducing systemic toxicity.
METHODS: Forty immune-competent Fischer rats were inoculated with 106 mesothelioma cells. Ten days later, left pneumonectomy with tumor debulking was performed. Twenty animals underwent local application of cisplatin solution (100 mg/m2), whereas the same quantity of cisplatin was topically applied as a gel with the Vivostat (Vivolution) system in 20 other animals. In each group 5 subgroups of 4 animals were defined according to the harvesting time of blood and tissue samples (2, 4, 24, and 72 hours and 1 week) after local therapy. Platinum concentrations in serum and tissue and systemic toxicity were analyzed.
RESULTS: Platinum concentrations in tissue were significantly higher in the gel group (group 1) than in the solution group (group 2) at 1, 3, and 7 days after therapy (1510, 1224, and 1069 pg/mg for group 1 vs 598, 382, and 287 pg/mg for group 2; P = .007, P = .005, and P = .0002, respectively). Laboratory findings showed renal insufficiency in the animals of the solution group at 1 week, with values of 98 mmol/L versus 7.7 mmol/L for urea and 410 µmol/L versus 43 µmol/L for creatinine (P = .02 and P = .01, respectively), which was confirmed by means of pathologic analysis.
CONCLUSIONS: Intrapleural administration of cisplatin with the carrier Vivostat significantly provides sustained higher platinum concentrations up to 1 week in tissue in comparison with application of cisplatin solution without conferring systemic toxicity in this model.
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