Pharmacokinetics of Oxaliplatin in Gastrointestinal Cancer Patients with Malignant Ascites

AbstractAbstractThe pharmacokinetics of oxaliplatin in plasma and ascitic fluid was investigated in 5 gastrointestinal cancer patients with malignant ascites. Oxaliplatin was administered at 85 mg/m2 by 2-hour infusion in the FOLFOX4 regimen, and the concentrations of total and free platinum were measured. There was a trend of lower plasma Cmax values of total platinum in patients with a larger volume of ascetic fluid. The AUC0-t values of mean concentration curves of total plasma platinum, total ascites platinum, free plasma platinum, and free ascites platinum were 31.15, 7.96, 4.93 and 2.93 μg·h/ml, respectively. The concentrations of free ascites platinum were similar to those of free plasma platinum at the last sampling time of 26 h in each patient. The decrease or disappearance of ascitic fluid was observed in 4 patients. These results suggest that oxaliplatin exerted a beneficial effect in gastrointestinal cancer patients with malignant ascites, even when administered intravenously.Keywords: Gastrointestinal cancerascitesoxaliplatinFOLFOX4pharmacokinetics