[Pharmacokinetics and toxicological study on the intraperitoneal administration of cisplatin and etoposide in gynecological malignancies].

We administered cisplatin and etoposide into the peritoneal cavity of 13 postoperative patients with gynecological malignancies, and studied the pharmacokinetics and toxicity in the combination of both drugs. Cisplatin 100 mg/body and etoposide 200 mg-400 mg/body were mixed together in 500 ml or 1,500 ml of normal saline and administered intraperitoneally on the day of operation and two or three weeks later. The peritoneal peak level of free cisplatin, diluted with 500 ml, was about two times higher than that, diluted with 1,500 ml. However, there was no difference in the peritoneal and plasma AUC. The peritoneal level and AUC of etoposide, diluted with 500 ml, was about two times higher than that, diluted with 1,500 ml. Among the groups of 1,500 ml, peritoneal and plasma levels and AUC were almost proportional to the doses. Nausea and vomiting were experienced in all patients. With the increase of etoposide, more marrow suppression was observed. However, we encountered no other significant side effects. In conclusion, intraperitoneal administration of cisplatin and etoposide in this setting can be used safely with minimum side effects, and the dilution of 1,500 ml seems to be better.