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Journal of Clinical Oncology, Vol 24, No 25 (September 1), 2006: pp. 4196-4201 © 2006 American Society of Clinical Oncology. DOI: 10.1200/JCO.2005.05.5152 Randomized Multicenter Trial of Hyperthermic Isolated Limb Perfusion With Melphalan Alone Compared With Melphalan Plus Tumor Necrosis Factor: American College of Surgeons Oncology Group Trial Z0020
From The University of Texas M.D. Anderson Cancer Center, Houston, TX; University of Pennsylvania, Philadelphia, PA; Duke University Medical Center, Durham; Carolinas Medical Center, Charlotte, NC; University of Illinois at Chicago, Chicago; Evanston Northwestern Healthcare, Evanston, IL; Latter Day Saints Hospital, Salt Lake City, UT; University of Cincinnati Medical Center, Cincinnati, OH; Roswell Park Cancer Institute, Buffalo, NY; Warren Grant Magnuson Clinical Center, and National Institutes of Health, Bethesda, MD Address reprint requests to Douglas S. Tyler, MD, Duke University Medical Center, Box 3118, Durham, NC 27710; e-mail: tyler002{at}acpub.duke.edu
Purpose To determine in a randomized prospective multi-institutional trial whether the addition of tumor necrosis factor alpha (TNF- ) to a melphalan-based hyperthermic isolated limb perfusion (HILP) treatment would improve the complete response rate for locally advanced extremity melanoma.
Patients and Methods Patients with locally advanced extremity melanoma were randomly assigned to receive melphalan or melphalan plus TNF-
Results The intervention was completed in 124 patients of the 133 enrolled. Grade 4 adverse events were observed in 14 (12%) of 129 patients, with three (4%) of 64 in the melphalan-alone arm and 11 (16%) of 65 in the melphalan-plus-TNF-
Conclusion In locally advanced extremity melanoma treated with HILP, the addition of TNF-
Melanoma is increasing in incidence, with 55,000 new cases expected in 2006. In 2% to 10% of extremity melanoma cases, recurrence is in a locoregional fashion, remaining confined to the extremity in a pattern called in-transit disease or satellitosis.1,2 Although regional recurrences often precede metastatic disease, it is thought that aggressive locoregional therapy may improve disease-free and overall survival. Radical surgical treatment of in-transit metastases by amputation has resulted in long-term cure rates of 21% to 33%,3,4 suggesting that some patients with locally advanced melanoma may have disease that is truly confined to the extremity. Because melanoma is typically resistant to systemic chemotherapy, interest has focused on high-dose regional chemotherapy using melphalan to achieve limb-sparing regional disease control. Isolated limb perfusion (ILP) was developed as a limb-sparing regional treatment modality for melanoma,5 with the hypothesized benefit of increasing local concentrations of chemotherapy to the primary site while limiting systemic toxicity. With appropriate surgical techniques, leakage from the isolated perfusion circuit can be limited to 5% or less.6 Hyperthermia was added to ILP in 1969 based on in vitro data showing synergistic cytotoxicity of alkylating agents and heat.7 Initial series of ILP with melphalan as a single agent at normothermic temperatures have overall response rates ranging from 30% to 60% with half of the responses being complete responses (CR).8 In contrast, systemic chemotherapy typically results in a 10% to 20% partial response rate with rare CRs.9 The combination of hyperthermia to melphalan perfusion appears to increase overall response rates to approximately 80% to 90% and CR rates to 25% to 60%.10-15
More recently, the addition of tumor necrosis factor alpha (TNF-
The study was designed by ACOSOG investigators and was reviewed and approved by the Cancer Therapy Evaluation Program (CTEP) of the National Cancer Institute (Bethesda, MD). The protocol was approved by the institutional review board for each participating institution before patient enrollment; all patients provided written informed consent. Patients with locally advanced extremity melanoma were identified by participating surgeons from their practices.
Inclusion and Exclusion Criteria
Patients were excluded if they had received chemotherapy, radiotherapy, or biologic therapy 30 days before registration, had hypersensitivity to melphalan or TNF-
Intervention and Randomization
Commercially available melphalan (GlaxoSmithKline Pharmaceuticals, Research Triangle Park, NC) was used in both treatment arms and dosing was 10 mg/L of tissue volume for the lower extremity and 13 mg/L tissue volume for the upper extremity. The melphalan-alone arm included a 25-minute sham-period of heated perfusion before melphalan perfusion to simulate the period of TNF-
Clinical End Points The primary clinical end point of the study was tumor response. It was assessed at 3 months and was classified as (1) complete response, (2) partial response, (3) stable disease, or (4) local progression. A CR was defined as complete disappearance of all clinical and radiologic evidence of disease for at least 8 weeks duration from the time of maximal response. A partial response was defined as 50% decrease of the sum of the products of perpendicular diameters of all measurable lesions without the appearance of new lesions for at least 8 weeks from the time of maximal response. Stable disease was defined as less than a partial tumor response or a response of less than 8 weeks' duration from the time of maximal response. Local progression was defined as having any new lesions in the perfusion field, or a more than 25% increase in the products of perpendicular diameters of any measurable lesions located in the perfusion field from the size at best response, or a 25% increase in the sum of all measurable lesions in the perfusion field. Secondary end points included treatment toxicity, regional disease symptoms, local recurrence–free survival, and overall survival.
Statistical Analysis The ACOSOG Data and Safety Monitoring Committee (DSMC) monitored the progress of this study semiannually. An interim analysis was planned for the first 108 patients.
Patient characteristics and adverse events (AEs) were summarized by frequency distributions. Contingency tables and Fisher's exact tests were used to model the effect of individual patient clinical characteristics (treatment arm, temperature during perfusion, intraoperative leak status, tumor burden, regional nodal disease status, sex, disease site) and institution patient volume on the following outcomes: CR at 3 and 6 months, and occurrence of AEs
Interim Results The ACOSOG Z0020 trial opened for enrollment on March 29, 1999. Accrual was suspended in May 2001 as TNF- was temporarily unavailable from the manufacturer, but resumed again in August 2001. The DSMC reviewed interim analysis performed on 118 patients. After reviewing this analysis and the efficacy stopping rules outlined in the protocol, the DSMC recommended that the study be stopped early as they concluded that there was a sufficient lack of evidence of a difference favoring the melphalan-plus-TNF- arm. The Group Chair accepted this recommendation, and the study closed to patient accrual on January 16, 2004, after 133 patients had been enrolled. At the time of the interim analysis, it was also noted that the rate of AEs grade 3 was 33% in the melphalan-alone arm and 37% in melphalan-plus-TNF- arm (P = .699). The rate of grade 4 AEs that could definitely or probably be attributed to treatment was reported in one patient (1%) in the melphalan-alone arm and seven patients (11%) in the melphalan-plus-TNF- arm (P = .057).
Final Results
The intervention was completed in 124 of the 133 enrolled patients. Of the 124 patients with complete intervention, eight did not have 3-month response data available, leaving 116 patients available for analysis. Reasons for incomplete intervention and missing follow-up data are shown in Figure 2.
Response rates at 3 months are listed in Table 2. The CR rate was 25% in the melphalan-alone arm and 26% in the melphalan-plus-TNF- arm (P = .890). Response to treatment was observed in 64% of patients (36 of 58) in the melphalan-alone arm and 69% of patients (40 of 58) in the melphalan-plus-TNF- arm (P = .435). When comparing arms of the study, no statistically significant differences were observed for tumor burden, prior perfusion, regional nodal status, sex, optimal hyperthermia by 30 minutes, institution volume, or type of extremity (upper v lower).
AE data were available for 130 of the 133 patients (including six patients who did not complete HILP). A summary of all AEs grade 3 for patients completing HILP is listed in Table 3. Grade 4 AEs were observed in 14 patients (11%), with three of 64 patients (5%) in the melphalan-alone arm and 11 of 66 patients (17%) in the melphalan-plus-TNF- arm (P = .028). There were no grade 5 AEs in either arm. There were two toxicity-related lower extremity amputations in the melphalan-plus-TNF- arm. One patient in the melphalan-alone arm had a disease progression–related upper extremity amputation. There was no statistically significant difference in AE occurrence based on sex or institution volume.
Although the CR rate at 6 months was not a primary end point, analysis suggested an improved CR rate in the melphalan-plus-TNF- arm in patients with available data. Response outcome was available for 89 patients (44 patients in the melphalan-only arm and 45 patients in the melphalan-plus-TNF- arm) at the 6-month time point. A CR had occurred in nine patients (20%) in the melphalan-alone arm and in 19 patients (42%) in the melphalan-plus-TNF- arm (Table 4). Only 65% of the patients (nine of 14) in the melphalan-alone arm maintained their CR at 6 months. In contrast, 80% (12 of 15) of the patients in the melphalan-plus-TNF- arm were able to maintain their CR. Moreover, six patients in the melphalan-plus-TNF- arm who were partial responders at 3 months continued to evolve their response such that they achieved CR at 6 months. This phenomenon was not seen in the melphalan-alone arm.
This ACOSOG Z0020 prospective, randomized trial did not demonstrate a benefit for the addition of TNF- to HILP with melphalan at the 3-month follow-up time point. No difference was found in the CR rate or in overall survival at 3 months after randomization, regardless of stratification variables and patient demographics. In addition, the melphalan-plus-TNF- arm had significantly more grade 4 AEs than the melphalan-alone arm. Given the observed lack of benefit, the higher complication rate, and the prespecified stopping rules at the interim analysis, the DSMC recommended that the study be stopped.
It is possible that the study may not have been adequately designed to evaluate the effects of adding TNF-
The response and AE rates in this randomized trial differ significantly from previous studies (Table 5). Early experience with the triple therapy regimen of melphalan/IFN/TNF-
In contrast, the complete response rates in both arms of our study were considerably lower than the response rates demonstrated in previous studies. Several key differences between these studies and our study could contribute to this finding, including procedural differences, drug pharmacokinetics, TNF- preparation, patient selection (higher tumor stage, greater tumor burden), and the use of IFN in other studies. The technique of HILP used in this study is well described and includes the key features of adequate vascular isolation of the limb, appropriate flow rate and dosimetry, and avoidance of hypothermia.29,30 However, despite specifications in the study protocol that established a uniform procedure for limb perfusion, variation in results could be related to investigator experience or subtle differences in technique at the participating sites. Drug pharmacokinetics may differ with alterations in flow rate and may affect outcome, and these differences have not been well described in any of the randomized studies. In addition, various studies have used recombinant human TNF- produced by several different manufacturers. As a consequence, differences among the various preparations of recombinant human TNF- may have had an impact on the results, although the studies are too small to adequately address this. The ACOSOG Z0020 did not include the use of IFN-gamma, whereas the other phase III studies did,19,21 although as described herein, the European trial showed no difference with the addition of IFN-gamma.21 Lastly, the addition of the 25-minute sham period of heated perfusion before melphalan administration may have contributed to the less pronounced difference between the two arms, compared with previous nonrandomized studies that did not use a sham perfusion.
Although more grade 4 AEs occurred in the melphalan-plus-TNF-
Regional therapy remains a good strategy for the treatment of advanced local extremity melanoma, both for potential cure of disease confined to the extremity, and for palliation and improved quality of life in patients with bulky or symptomatic disease, or disease that would otherwise be unresectable barring amputation. This is a relatively safe and effective treatment modality compared with systemic chemotherapy. Although this study did not support the addition of TNF-
The author indicated no potential conflicts of interest.
We appreciate the contribution Arthur Boddie, MD, made to this manuscript. We would also like to acknowledge all the clinical research assistants and institutions that enrolled patients onto ACOSOG Z0020.
Supported by Grant No. U10 CA076001 from the National Cancer Institute. Presented at the 2005 Annual Cancer Symposium of the Society of Surgical Oncology, Atlanta, GA, March 4, 2005. Authors' disclosures of potential conflicts of interest and author contributions are found at the end of this article.
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Grunhagen DJ, Brunstein F, Graveland WJ, et al: One hundred consecutive isolated limb perfusions with TNF-alpha and melphalan in melanoma patients with multiple in-transit metastases. Ann Surg 240:939-947, 2004[CrossRef][Medline] 27. Noorda EM, Vrouenraets BC, Nieweg OE, et al: Isolated limb perfusion for unresectable melanoma of the extremities. Arch Surg 139:1237-1242, 2004 28. Rossi CR, Foletto M, Mocellin S, et al: Hyperthermic isolated limb perfusion with low-dose tumor necrosis factor-alpha and melphalan for bulky in-transit melanoma metastases. Ann Surg Oncol 11:173-177, 2004[CrossRef][Medline] 29. Alexander HR, Fraker DL, Bartlett DL: Isolated limb perfusion for malignant melanoma. Semin Surg Oncol 12:416-428, 1996[CrossRef][Medline] 30. Schraffordt Koops HS, Kroon BB, Lejeune FJ, et al: Management of local recurrence, satellites, and in transit metastases of the limbs with isolation perfusion, in Lejeune FJ, Chaudhuri PK, Das Gupta TK (eds): Malignant Melanoma: Medical and Surgical Management. New York, NY, McGraw Hill Inc, 1994, pp 221-231 Submitted January 23, 2006; accepted June 30, 2006.
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Copyright © 2006 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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