In vivo sustained release of cisplatin from bioresorbable implants in mice.

Two kinds of cisplatin-containing implants were prepared from polylactic acid (type I) and from lactic acid-glycolic acid copolymer (type II). Type I implants were almost unaffected when inserted in the renal parenchyma of mice. In contrast, type II implants evolved clearly after in vivo implantation. X-ray pictures and platinum concentration measurements showed a continuous release of platinum over at least three weeks. The release resulted in high platinum concentrations in the kidney tissues and low plasma concentrations, compared to systemic injection. Type II implants seem adequate for further clinical trials of local treatment by cisplatin.