Purpose: To determine the toxicities, pharmacokinetics, and maximally tolerated doses of oxaliplatin in patients with hepatic impairment and to develop formal guidelines for oxaliplatin dosing in this patient population. Experimental Design: Sixty adult cancer patients with variable hepatic function received i.v. oxaliplatin ranging from 60 to 130 mg/m 2 every 3 weeks. Patients were stratified by levels of total bilirubin, aspartate aminotransferase (AST), and alkaline phosphatase (AP) into

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... cohorts based on the degree of hepatic dysfunction: control group A [bilirubin, AST, and AP V upper limit of normal (ULN)], mild dysfunction group B (bilirubin V ULN, ULN < AST V 2.5 Â ULN, or ULN < AP V 5 Â ULN), moderate dysfunction group C (ULN < bilirubin V 3.0 mg/dL, AST > 2.5 Â ULN, or AP > 5 Â ULN), severe dysfunction group D (bilirubin > 3.0 mg/dL, any AST, and any AP), and liver transplantation group E (any bilirubin, any AST, and any AP). Doses were escalated in cohorts of three patients, and urine and plasma ultrafiltrates were assayed for platinum concentrations. Results: Dose escalation of single-agent oxaliplatin to 130 mg/m 2 was well tolerated in all cohorts. Platinum clearance did not correlate with any liver function test. Two of 56 assessable patients with a diagnosis of laryngeal carcinoma and cervical adenocarcinoma experienced partial responses lasting 3 and 5.5 months. Conclusions: Oxaliplatin at 130 mg/m 2 every 3 weeks was well tolerated in all patients with impaired liver function. Dose reductions of single-agent oxaliplatin are not indicated in patients with hepatic dysfunction.