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Cancer Therapy: Clinical |
Authors' Affiliations: 1 City of Hope Comprehensive Cancer Center, Duarte, California; 2 Institute for Drug Development, Cancer Therapy and Research Center, San Antonio, Texas; 3 University of California, Davis Cancer Center, Sacramento, California; 4 Albert Einstein College of Medicine, Bronx, New York; 5 Case Western Comprehensive Cancer Center, Cleveland, Ohio; 6 University of Wisconsin Comprehensive Cancer Center, Madison, Wisconsin; 7 New York University Cancer Institute; 8 Memorial Sloan-Kettering Cancer Center, New York, New York; 9 University of Pittsburgh Comprehensive Cancer Center, Pittsburgh, Pennsylvania; 10 University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California; 11 Department of Clinical Pharmacokinetics and Drug Metabolism, Sanofi-Synthelabo, Inc., Malvern, Pennsylvania; 12 PSI International, Inc., Vienna, Virginia; and 13 Investigational Drug Branch, Cancer Therapy Evaluation Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Bethesda, Maryland
Requests for reprints: Chris H. Takimoto, Institute for Drug Development, Cancer Therapy and Research Center, 14960 Omicron Drive, San Antonio, TX 78245-3217. Phone: 210-450-3800; Fax: 210-677-0058; E-mail: ctakimot{at}idd.org.
| Abstract |
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Experimental Design: Sixty adult cancer patients with variable hepatic function received i.v. oxaliplatin ranging from 60 to 130 mg/m2 every 3 weeks. Patients were stratified by levels of total bilirubin, aspartate aminotransferase (AST), and alkaline phosphatase (AP) into five cohorts based on the degree of hepatic dysfunction: control group A [bilirubin, AST, and AP
upper limit of normal (ULN)], mild dysfunction group B (bilirubin
ULN, ULN < AST
2.5 x ULN, or ULN < AP
5 x ULN), moderate dysfunction group C (ULN < bilirubin
3.0 mg/dL, AST > 2.5 x ULN, or AP > 5 x 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/m2 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/m2 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.
The majority of platinum derivatives are cleared by renal excretion; however, the effect of hepatic impairment on the pharmacology of agents, such as oxaliplatin, may still be clinically important. Over 40% of colorectal cancer patients have hepatic metastases at necropsy, making the liver the most common site of hematogenous spread (3). Furthermore, liver function abnormalities are common in patients with hepatic metastases. Thus, defining the optimal regimen for administering oxaliplatin to cancer patients with liver dysfunction is an important clinical question. Even if oxaliplatin kinetics are unchanged by hepatic impairment, other factors may be altered, such as albumin plasma protein concentrations, which could affect clinical drug effects. Finally, the Food and Drug Administration guidance for industry specifically states that for drugs with minimal hepatic clearance (<20%), hepatic impairment studies may still be of value if the agents have a narrow therapeutic range (4). Anticancer chemotherapeutic drugs, such as the platinum derivatives, are generally considered narrow therapeutic range agents. For these reasons, there is distinct clinical relevance to testing widely used anticancer agents, such as oxaliplatin, in this patient population (5).
Because no formal guidelines exist for oxaliplatin dosing in cancer patients with hepatic impairment, we initiated this dose-escalating, pharmacokinetic, and safety trial of single-agent oxaliplatin in patients with hepatic dysfunction as defined by the following liver function tests: total bilirubin, serum aspartate aminotransferase (AST), and serum alkaline phosphatase (AP). The primary objective was to determine the maximally tolerated dose of oxaliplatin in patients with hepatic dysfunction, and secondary objectives included defining the toxicity profile of this regimen, monitoring platinum pharmacokinetics, and characterizing any antitumor activity. This study was conducted by the National Cancer Institute (NCI) Organ Dysfunction Working Group and coordinated by the NCI Cancer Therapy Evaluation Program. A separate NCI Organ Dysfunction Working Group companion study in renal dysfunction patients was conducted simultaneously (6).
| Materials and Methods |
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18 years of age with histologically confirmed advanced malignancy and if previously treated with
3 prior chemotherapy regimens. Prior platinum, but not oxaliplatin, chemotherapy was permitted. Other eligibility criteria included Eastern Cooperative Oncology Group performance status of 0 to 2 (Karnofsky
60%), leukocyte count
3,000/µL, absolute neutrophil count
1,500/µL, platelet count
100,000/µL, creatinine within normal institutional limits, or measured creatinine clearance
60 mL/min for patients with creatinine levels above institutional normal, and no history of brain metastases or significant peripheral neuropathy. Each participating institution's institutional review board approved the protocol, and written informed consent was obtained from all patients. Study design. Eight separate institutions in the NCI Organ Dysfunction Working Group enrolled patients into one of five cohorts based on the degree of liver dysfunction (Table 1 ). All liver function tests were completed within 24 h of the start of treatment. Different laboratories at each participating institution were used for assessments, and no cross-standardization or corrections for assay methods were done.
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Drug formulation and administration. Oxaliplatin was supplied by NCI/Cancer Therapy Evaluation Program as a sterile freeze-dried powder for i.v. administration in glass vials containing 50 or 100 mg oxaliplatin and lactose monohydrate. Oxaliplatin was provided to the NCI under a cooperative research and development agreement with Sanofi-Synthelabo. Oxaliplatin was diluted into a volume of 250 to 500 mL of 5% dextrose in water and administered as a continuous 2-h i.v. infusion within 8 h of preparation.
Sample acquisition, handling, and analytic methods. Blood samples for plasma and plasma ultrafiltrate platinum concentrations were collected during cycles 1 and 2 before treatment, at the end of the 2-h infusion, at 2.25, 2.75, 3, 5, 8, 24, and 48 h after the start of the infusion, and at 1, 2, and 3 weeks after treatment. Plasma and plasma ultrafiltrate samples were prepared as described previously (6). Total urine output from 0 to 24 and 24 to 48 h was collected during cycle 1 of therapy, and a 10-mL aliquot from each pool was analyzed to determine platinum excretion.
All oxaliplatin assays were done in the Analytical Pharmacology Core facility at the City of Hope using a validated atomic absorption assay. The method has a limit of quantitation of 10 ng/mL and an intraday and interday precision and accuracy within ± 10%.
Pharmacokinetic analysis. Oxaliplatin-associated platinum pharmacokinetics in plasma and ultrafiltrates were analyzed as described previously (6). Mean values of kinetic variables in each liver dysfunction groups A to D were compared by ANOVA methods and by analysis of covariance methods to adjust for dose effect. Terminal elimination half-life from plasma (t1/2) was the only variable with highly skewed distribution, and its corresponding significance tests were evaluated using rank values. The relationships between plasma ultrafiltrate platinum clearance and measured organ dysfunction variables (bilirubin, AST, and AP) were examined by linear regression.
| Results |
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-glutamyl transpeptidase and one grade 3 hyperglycemia). The DLTs observed in the group C and group D patients were grade 3 metabolic disorders, and although they were reported initially as oxaliplatin related, after a comprehensive retrospective review, progressive metastatic disease was felt to be the underlying etiology. Furthermore, because no DLTs were observed at the two highest dose levels, the maximally tolerated dose was defined as 130 mg/m2 oxaliplatin for both group C and D patients. In the control group A, 12 patients received 46 cycles of oxaliplatin. All were started at 130 mg/m2 oxaliplatin, although two patients were later dose reduced to 104 mg/m2 because of grade 4 hyperuricemia (one patient) and lymphopenia (one patient). Overall, myelosuppression was modest (Table 4 ), and nonhematologic toxicities included grade 1 nausea in three patients (25%), grade 1 fatigue (25%), and grade 2 nausea and vomiting (33%). The most common drug-related toxicity was peripheral neuropathy, which was grade 1 in eight (67%) patients and grade 2 in two (16%) patients.
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In group C, eight patients received 13 cycles of oxaliplatin at 80 mg/m2, three patients received 12 cycles at 105 mg/m2, and 5 patients received 10 cycles at 130 mg/m2. All oxaliplatin dose levels were well tolerated, and no grade 3 or worse hematologic adverse events were reported (Table 4). Two patients in each of the lower dose levels experienced grade 1 neuropathies (25% and 67% of patients in the 80 and 105 mg/m2 groups, respectively) as did four (80%) patients in the highest dose group.
In the severe dysfunction group D, five patients received 13 cycles at 60 mg/m2, four patients received 12 cycles at 80 mg/m2, four patients received 16 cycles at 105 mg/m2, and three patients received 5 cycles at 130 mg/m2. Hematologic adverse events were few, with only one grade 2 decreased hemoglobin in the 60, 80, and 130 mg/m2 dose groups. Likewise, sensory neuropathies were limited, with three instances (75% of patients) of grade 1 at the 105 mg/m2 dose level. The single liver transplant patient in group E received four cycles of oxaliplatin at 60 mg/m2, which were extremely well tolerated (Table 4).
An increase in total bilirubin occurred in later cycles at the lowest dose in one patient with severe hepatic dysfunction, and bilirubin elevations improved in a single group D patient treated at the highest dose level. However, overall, there was no evidence of any consistent drug-related alterations in bilirubin or AST or AP (data not shown) in any cohort of hepatically impaired patients.
Four patients were removed from the study due to treatment-related toxicities. One group A patient withdrew after experiencing grade 2 fatigue, diarrhea, vomiting, and memory loss after four cycles of oxaliplatin (three of which were at a reduced dose of 105 mg/m2). Two patients in group B treated with 130 mg/m2 were removed after one experienced a grade 4 hypersensitivity reaction and another developed worsening neurosensory changes after five courses. A patient in the group C 130 mg/m2 cohort experienced modest thrombocytopenia during the second cycle of treatment that did not resolve in time to continue therapy. No treatment-related toxic death occurred in this study.
Efficacy evaluation. Overall, 56 of the total 60 patients enrolled were evaluated for tumor response. Two patients had partial responses: one in the control group with laryngeal carcinoma and a second in group D at the 130 mg/m2 dose level with cervical adenocarcinoma. Twenty-two patients (39% overall) had stable disease as their best response. One patient in group A with adenocarcinoma with an unknown primary had stable disease for
6 months, and another patient in group D with hepatocellular carcinoma treated at 80 mg/m2 had stable disease for more than 5 months.
Pharmacokinetics. Plasma platinum pharmacokinetics were monitored in 54 patients in cycle 1 (Fig. 1 ; Table 5 ). At the highest dose level of 130 mg/m2, peak plasma concentrations (Cmax) were comparable across all hepatic dysfunction groups. Clearance of ultrafilterable platinum was also comparable in groups A, B, and C at the 130 mg/m2 dose level (Fig. 1; Table 5). The small number of patients with pharmacokinetic data in groups D and E precludes formal comparisons in these cohorts. Alterations in hepatic function had no effect on ultrafiltrate platinum Cmax or the initial distribution half-life. No correlation was found between urinary platinum elimination and liver dysfunction group (data not shown). Ultrafilterable platinum clearance did not correlate with total bilirubin (correlation coefficient, r = 0.23; P = 0.13), AST (r = 0.01; P = 0.95), or AP (r = 0.09; P = 0.57) concentrations.
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| Discussion |
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As shown in Fig. 1, the liver function variables used to stratify patients into liver dysfunction cohorts (bilirubin, AST, and AP) were not associated with significant differences in oxaliplatin platinum clearance from plasma ultrafiltrates. Only serum creatinine showed a statistically significant association. These data are consistent with our companion study of oxaliplatin pharmacokinetics in patients with renal dysfunction that showed a strong association between platinum clearance from plasma ultrafiltrates and creatinine clearance (6). However, even in patients with moderate renal dysfunction (creatinine clearance
20 mL/min), dose modifications of single-agent oxaliplatin are not required because the increase in systemic exposure to oxaliplatin-associated platinum species is not associated with increased oxaliplatin-induced toxicities (6).
This apparent paradox is explained, in part, by the poor correlation between the pharmacokinetics of undifferentiated platinum species in plasma ultrafiltrates and clinical drug effects. As summarized by Graham et al. (8), the kinetics of oxaliplatin-associated platinum in plasma ultrafiltrates are well described by a multicompartmental model with a relatively brief initial half-life of 0.28 h, with much longer terminal elimination phase of elimination. The short initial phase half-life of platinum in plasma ultrafiltrates reflects the rapid conversion of oxaliplatin into reactive biotransformation products that quickly form inactive conjugates (9). In contrast, the later phases of platinum clearance reflect the renal elimination of largely inactive platinum species that do not correlate with clinical drug effects. Unfortunately, analysis of platinum species in plasma using inductive-coupled plasma mass spectrometry or atomic absorption spectroscopy cannot distinguish between active and inactive oxaliplatin biotransformation products. Two to 3 h after the infusion, the majority of active oxaliplatin species have disappeared from plasma (9).
Phase I liver dysfunction studies are complicated by the lack of easily measurable variables that are predictive of the clearance of hepatically eliminated drugs (5). In our study, oncology patients were stratified by the NCI Organ Dysfunction Working Group criteria based on bilirubin, AST, and AP measurements. Although, the validity of these variables to predict drug clearance on a consistent basis has not been shown, this stratification provides an easy and practical means to minimize risk for dose escalation studies in cancer patients with hepatic impairment. Current Food and Drug Administration guidelines for hepatic dysfunction studies recommend the stratification of patients by Child-Pugh classification, which is based on assessments of bilirubin, albumin, prothrombin time, encephalopathy, and ascities (4). Because the Child-Pugh criteria were intended originally to assess surgical risk in cirrhotic patients, it has several potential disadvantages for use in oncology patients (10). For example, variables, such as encephalopathy, may not be relevant to solid tumor patients, and albumin levels may reflect a patient's nutritional status in addition to hepatic synthetic capacity. Finally, the majority of our patients had liver dysfunction secondary to hepatic metastases; however, no attempt was made to discern the underlying cause of liver impairment in individual patients. Further studies on the optimal method for reducing risk and predicting hepatic drug clearance in cancer patients are necessary to establish standard stratification criteria for these important types of oncology studies. Nonetheless, the lack of correlation between oxaliplatin clearance and assessments of liver function make these study design issues less relevant for dosing oxaliplatin-based chemotherapy.
In common practice, oxaliplatin is administered in combination with fluoropyrimidine-based therapy and not as a single agent. Thus, our data do not provide direct dosing guidelines for this clinical situation. Nonetheless, the data derived here are compelling in that they suggest that dose reductions are not indicated for oxaliplatin-based chemotherapy in patients with severe hepatic dysfunction.
In summary, full doses of single-agent oxaliplatin at 130 mg/m2 can be safely administered every 3 weeks to cancer patients with hepatic dysfunction. Oxaliplatin-associated platinum clearance from plasma ultrafiltrates did not correlate with any measure of liver function and no increase in oxaliplatin-induced toxicities was observed in patients with any degree of hepatic dysfunction. Our data support the recommendation that dose reductions of single-agent oxaliplatin are not necessary in patients with hepatic dysfunction.
| Acknowledgments |
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| Footnotes |
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The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
Received 9/27/06; revised 2/ 6/07; accepted 3/29/07.
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