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Originally published as JCO Early Release 10.1200/JCO.2005.01.1551 on October 31 2005 © 2005 American Society of Clinical Oncology. Temozolomide in Combination With Interferon-Alfa Versus Temozolomide Alone in Patients With Advanced Metastatic Melanoma: A Randomized, Phase III, Multicenter Study from the Dermatologic Cooperative Oncology Group
From the Departments of Dermatology, J.W. Goethe-University, Frankfurt am Main; University of Tübingen, Tübingen; University of Köln, Cologne; University of Erlangen, Erlangen/Stuttgart; University of Regensburg, Regensburg; Helios Clinic Erfurt, Erfurt; Saarland University, Homburg; Skin Cancer Unit, German Cancer Research Center, Mannheim; University of Würzburg, Würzburg; University of Dresden, Dresden; University of Schleswig-Holstein Campus Lübeck, Lübeck; University of Göttingen, Göttingen, Germany; and University of Zürich, Switzerland Please address reprint requests to Konstanze Spieth, MD, Department of Dermatology, J.W. Goethe-University, Frankfurt am Main, Germany; e-mail: konstanze.spieth{at}kgu.de.
PURPOSE: Temozolomide (TMZ) has shown efficacy in metastatic melanoma equal to that of dacarbazine (DTIC), the standard chemotherapeutic agent for melanoma. As the combination with interferon-alfa (IFN- ) appears superior to single-agent DTIC regarding response rates, the purpose of this study was to compare TMZ alone and TMZ plus IFN- in terms of objective response (OR), overall survival, and safety in a prospective, randomized, multicenter trial.
PATIENTS AND METHODS: Two hundred ninety-four patients with untreated stage IV metastatic melanoma (American Joint Committee on Cancer staging system) were randomly assigned to receive either oral TMZ alone (200 mg/m2/day; days 1 through 5 every 28 days) or in combination with subcutaneous IFN-
RESULTS: Two hundred eighty-two patients were eligible for an intent-to-treat analysis, 271 patients were treated per protocol. In the TMZ + IFN-
CONCLUSION: In metastatic melanoma treatment with TMZ + IFN-
Despite enormous efforts to diagnose melanoma at more early stages, the mortality rate continues to increase because of the significant rise in incidence. Currently, approximately two to three of 100,000 people per year die from melanoma in the northern hemisphere.1,2 Metastatic melanoma has remained nearly refractory to systemic treatment for decades. After completion of numerous trials with different cytotoxic and immunomodulatory substances as single agent or combination, dacarbazine (DTIC) is still considered as standard monochemotherapy.3 The modern orally available agent temozolomide (TMZ) is an imidazotetrazinone with activity attributed to the formation of a reactive methyldiazonium cation and methylation of O6-guanine in DNA. It shares its active metabolite methyl-triazenyl imidazole carboxamide (MTIC) with DTIC. Because of its chemical structure and pharmacokinetic properties, it has distinct advantages over DTIC. It is absorbed rapidly and nearly completely after oral administration. TMZ is spontaneously activated into MTIC at physiologic pH in aqueous solution, whereas DTIC requires enzymatic demethylation in the liver to be converted into the reactive species. TMZ has an excellent penetration profile into all body tissues, including the brain. Currently TMZ is approved for refractory anaplastic astrocytoma and submitted to US Food and Drug Administration and the European Medicines Evaluation Agency for approval in first line therapy of glioblastoma multiforme. The first trial with TMZ in patients with metastatic melanoma was conducted in 1992.4 This phase I trial established the schedule of the 5-day oral application on a 4-week cycle and demonstrated clinical activity in melanoma, confirmed also in a phase II study in 56 patients with advanced melanoma.5 Dose-limiting toxicity occurred after a single-dose of 1,000 mg/m2 and after five consecutive doses of 200 mg/m2, leading to the phase III trial by Middleton,6 in which patients were randomly assigned to receive either oral temozolomide at a dosage of 200 mg/m2/day for 5 days every 28 days or intravenous DTIC at a dosage of 250 mg/m2/day for 5 days every 21 days.
The current trial was designed to further clarify the role of interferon-alfa (IFN-
The protocol was approved by the ethics committee of the J.W. Goethe-University (Frankfurt, Germany) and by the local committees of all participating centers. The study was performed in accord with an assurance filed with and approved by the US Department of Health and Human Services.
Patients eligible for this trial provided written informed consent and had to fulfill the following inclusion criteria: histologically confirmed melanoma stage IV (American Joint Committee on Cancer staging system) with no prior systemic therapy in stage IV; a Karnofsky performance status Patients were not eligible if they had evidence of CNS metastases or had major concomitant illnesses of the cardiovascular, respiratory, or renal system, or if they were pregnant or nursing. Individuals with primary ocular or mucosal melanoma or those with nonmeasurable disease were not included.
Patient Treatment and Evaluation
TMZ doses were adjusted when grade 3 (TMZ 150 mg/m2) or grade 4 (TMZ 100 mg/m2) toxicity occurred according to the National Cancer Institute common toxicity criteria (NCI-CTC). To proceed with each cycle, the thrombocytes had to be greater 100.000/m3 and the neutrophils had to be greater 1,500/m3. The protocol suggested an antiemetic regimen comprised of a 5HT3-antagonist (ie, granisetron or ondansetron), and metoclopramide that could be altered according to local practice and patient needs. For managing constitutional symptoms of IFN- Evaluation of response was performed before treatment and repeated after every second cycle. Measurements of metastatic disease included physical examination as well as computed tomographic scans or magnetic resonance imaging of the brain, chest, abdomen and pelvis. Tumor responses were assessed using the bidimensional WHO criteria, because the response evaluation criteria in solid tumors (RECIST) were established only in 2000, when the recruitment of the study was already ongoing. Disease progression was defined as either the appearance of new lesions or an increase in disease > 25%. Stable disease was described as < 25% decrease or increase in disease bulk, partial response was defined as > 50% decrease in disease bulk. Complete response was defined by disappearance of all measurable metastatic lesions. There was no centralized review of the radiologic files provided.
Statistical Analysis
The patients' characteristics, response rates, and toxicities were compared using the
Between October 1998 and December 2001, 294 patients with histologically confirmed metastatic melanoma were included in the study at 31 centers in Germany (29) and Switzerland (2). Of these patients, 146 were randomly assigned to receive TMZ, and 148 to receive TMZ plus IFN- . Twelve patients (seven in the TMZ group and five in the TMZ + IFN- group) proved to be ineligible due to violations of inclusion criteria (n = 10) or due to missing follow-up data (n = 2). Two hundred eighty-two patients were found to be eligible for treatment (139 in the TMZ arm and 143 in the TMZ + IFN- arm) and made up the intent-to-treat (ITT) population. Treatment per protocol could not be conducted in two patients who withdrew their consent; nine more patients discontinued the study for personal reasons. Thus, 271 patients were treated per protocol (134 received TMZ and 137 patients received TMZ + IFN- ; Fig 1). Patient demographics showed similar results for both treatment arms. No significant differences in sex, age, performance status, site of metastatic disease and time from diagnosis to development of metastases could be observed. The median time from initial diagnosis to development of metastatic disease was 23.86 months for the TMZ group and 23 months for the group that received TMZ plus IFN- (P = .66; Table 1).
Overall Response, OS, and PFS The group receiving TMZ plus IFN- showed a statistically significant higher response rate (complete and partial remissions) compared with the TMZ group (P = .036). Of 137 patients with TMZ plus IFN- , 33 (24.1%) achieved a remission, whereas in the TMZ group, 18 (13.4%) of 134 had a response. TMZ plus IFN- showed more complete (8.0% v 2.2%) and partial responses (16.1% v 11.2%) than the TMZ group. In the TMZ group, more patients achieved stable disease (26.1% v 17.5%), whereas the progression rate showed no main differences (59.7% v 57.7%); two patients were not assessable concerning response (Table 2).
The median OS time in the ITT population was 8.4 months for the TMZ group (95% CI, 7.07 to 9.72) and 9.7 months for the group that received TMZ plus IFN- (95% CI, 8.26 to 11.18; Fig 2). The log-rank test did not show a significant difference between the two treatment groups (P = .16).
Among the responding patients (complete and partial responders), OS was 19.24 months for the TMZ group and 22.91 months for the TMZ plus IFN- group (P = .4037). Duration of response was longer in the group that received temozolomide plus IFN- , where 17 (48.6%) of 35 patients survived longer than 12 months, whereas in the temozolomide group, only seven (38.9%) of 18 patients survived longer than 1 year. PFS was 2.4 months for patients treated with TMZ alone (95% CI, 1.48 to 3.28 months) compared with 3.3 months for patients treated with TMZ plus IFN- (95% CI, 2.73 to 3.82 months; P = .11; Fig 3). The Cox regression analysis was performed to identify possible prognostic factors for OS and PFS. The baseline performance status (Karnofsky index [KI]) was of significant importance for OS, a lower KI being associated with a shortened median OS time (KI 80% v KI 90%; P = .002). For PFS, the baseline performance status was significant as well (KI 90% v 100%; P = .025).
Safety Of the 282 patients in the ITT population, two patients in the TMZ group and two patients in the TMZ plus IFN- group received less than one dose of study medication due to withdrawal of consent, disease-related complications and disease progression before the treatment was started. The remaining 278 patients made up the safety population (137 patients in the TMZ group, 141 in the TMZ plus IFN- group). A median of three cycles of treatment were administered in both treatment groups. Modifications of doses and intervals occurred particularly due to hematologic toxicity in accordance with the protocol and were significantly more frequent in the TMZ plus IFN- group (P < .001). Five hundred ninety-nine cycles of mono-agent TMZ were administered to 137 patients, 94 cycles (15.7%) were performed in a modified scheme: reduced doses (58 cycles), prolonged intervals (22 cycles) or prolonged intervals and reduced doses (14 cycles).
Seven hundred seventeen cycles of TMZ plus IFN-
Incidence of hematologic toxicity in all CTC grades, consisting primarily of thrombocytopenia and leucopenia, was significantly different between the two treatment groups (Table 3). Thrombocytopenia (grade 1 to 4) occurred in 47.1% of the patients of the TMZ plus IFN-
In the TMZ plus IFN- group, 56.6% developed a leucopenia (grade 3, 12.3%; grade 4, 8.2%). In the TMZ group, only 16.3% developed a leucopenia (grade 3, 2.6%; grade 4, 1.7%; P < .0001). Also neutropenia (34.3% v 7.9%; P < .001) and anemia (40.6% v 20.8%; P = .05) occurred more frequently in the TMZ plus IFN- group.
The most frequent nonhematologic adverse events were nausea and vomiting, constitutional symptoms such as fever and myalgia, constipation or diarrhea, and elevation of liver enzymes. These adverse effects were similar for both treatment groups, except for fever and constitutional symptoms (grade 1 to 4) which occurred significantly more often in the IFN-
The alkylating agent TMZ has been administered as treatment for metastatic melanoma for more than a decade now. A randomized phase III study demonstrated an efficacy of TMZ at least equal to that of DTIC with a nonstatistical benefit of increase in survival.6 Until now, there have been no randomized trials comparing single-agent TMZ and combination of TMZ with other drugs, which might be superior to monotherapy. Our study is the first large prospective, randomized, multicenter phase III study to evaluate the efficacy and tolerability of adding IFN- to monochemotherapy with TMZ. Two smaller, nonrandomized trials with this combination of therapy in patients with metastatic melanoma were published recently,10,11 as well as a trial with the identical combined regimen in patients with advanced renal cell carcinoma,12 confirming the significant impact of this regimen at present. In retrospect, it would have been advantageous to have acquired the lactate dehydrogenase (LDH) value in our study to stratify stages according to the current staging system; however at initiation of the trial, lactate dehydrogenase was not part of the existing system (Union International Contre le Cancer system).
Our data showed no statistically significant difference in survival between treatment arms, despite a significant increase in response rate. These results are comparable with the outcome of several previously published trials for chemoimmunotherapy with mono-agent DTIC and IFN-
At the same time one has to keep in mind that any combination of a chemotherapeutic agent with cytokines comes along with an increased toxicity, an effect we could confirm through the safety analysis in our trial as well. A considerable proportion of patients in the combination arm suffered from myelosuppression, the most frequent nonhematologic adverse effects were fever, nausea and emesis and abnormalities in hepatic enzymes. Although all treatment-related symptoms were manageable and reversible, dose reduction and interval prolongation were appropriate instruments to counteract occurrence of grade 3 and 4 myelosuppression. In previous trials, different regimen of the combination of TMZ and IFN-
Hypothesizing the efficacy of TMZ alone or in combination with IFN- A distinct advantage of TMZ concerning pharmacokinetics is its ability to cross the blood-brain barrier, providing approximately 20% of the systemic TMZ exposure measured in the plasma in the CSF.22 From our study, no conclusion can be drawn regarding the occurrence of brain metastases because this issue was not evaluated. TMZ has demonstrated a certain activity in CNS metastases from melanoma alone or in combination with radiation or other chemotherapeutic agents.23-26 Regarding the potential of TMZ to prevent or at least decelerate the occurrence of CNS metastases, controversial results from retrospective trials have been reported so far.27,28 Further prospective, randomized studies to define the potency of TMZ to treat or prevent cerebral metastases are warranted and urgently needed.
The disability of the combination of TMZ with IFN-
We would like to thank the additional investigators at different participating centers. Germany: MannheimR. Figl, MD, and C. ZimpferRechner, MD; DresdenS. Eppinger, MD, and A. Stein, MD; LübeckJ. Grabbe, MD; ErlangenC. Balz, MD; WürzburgP. Terheyden, MD, and A.O. Eggert, MD; ErfurtI. Kellner, MD; HomburgC. Pföhler, MD; KölnA. Jöckel, MD; RegensburgA. Glaessl, MD, and B. Coras, MD; GöttingenE.M. Habe Nicht, MD, and S. Emmert, MD; FrankfurtS. Hawerkamp, MD, and A. Gaul (study nurse); TübingenM. Kreissig (statistical evaluations); and investigators at participating centers in Aachen, Augsburg, Berlin Neukölln, Chemnitz, Dessau, Dortmung, Görlitz, Hamburg, Hameln, Hannover, Heidelberg, Jena, Leipzig, Magdeburg, Minden, Münster, Rostock, Stuttgart, Ulm, Wiesbaden, and Zwickau. Switzerland: ZürichT. Maier, MD; and investigators at participating centers in Bern.
Although all authors completed the disclosure declaration, the following authors or their immediate family members indicated a financial interest. No conflict exists for drugs or devices used in a study if they are not being evaluated as part of the investigation. For a detailed description of the disclosure categories, or for more information about ASCO's conflict of interest policy, please refer to the Author Disclosure Declaration and the Disclosures of Potential Conflicts of Interest section in Information for Contributors.
Dollar amount codes: (A) < $10,000 (B) $10,000-99,999 (C)
Supported by grants from Essex Pharma GmbH (Munich, Germany). R.K. and K.S. are co-senior authors. Presented in part at the 39th Annual Meeting of the American Society of Clinical Oncology, Chicago, IL, May 31-June 3, 2003. Terms in blue are defined in the glossary, found at the end of this issue and online at www.jco.org. Authors' disclosures of potential conflicts of interest are found at the end of this article.
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Copyright © 2005 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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