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Journal of Clinical Oncology, Vol 22, No 6 (March 15), 2004: pp. 1118-1125 © 2004 American Society of Clinical Oncology. DOI: 10.1200/JCO.2004.04.165 Fotemustine Compared With Dacarbazine in Patients With Disseminated Malignant Melanoma: A Phase III StudyFrom the Institut Gustave Roussy, Villejuif; CHU Sainte-Marguerite; CHRU de la Timone, Marseille; Centre Oscar Lambret, Lille; CHU Ambroise Paré, Boulogne Billancourt; Hôpital Beaujon, Clichy; Hôpital Foch, Suresnes, France; Universitäts-Hautklinik, Kiel; Dermatologisches Zentrum, Buxtehude; Allg. Krankenhaus St. Georg; Universitäts Krankenhaus Eppendorf, Hamburg; Friedrichs-Wihelms-Universitäts, Bonn; Fachklinik Hornheide, Münster, Germany; National Institute of Oncology, Budapest, Hungary; Norwegian Radium Hospital, Oslo, Norway; Instituto Valenciano de Oncología, Valencia; Clinica CONIM, Madrid; Hospital Central de Asturias, Oviedo, Spain; Allg. Krankenhaus, Wien, Austria; and Prednosta Internej Kliniky, Brastislava, Slovakia Address reprint requests to Marie Françoise Avril, MD, Institut Gustave Roussy, 39, rue Camille Desmoulins, 94805 Villejiuf Cedex, France; e-mail: avril{at}igr.fr
PURPOSE: To compare fotemustine and dacarbazine (DTIC) in terms of overall response rate (ORR) as primary end-point and overall survival, duration of responses, time to progression, time to occurrence of brain metastases (BM), and to assess safety and quality of life in patients with disseminated cutaneous melanoma. PATIENTS AND METHODS: Patients received either intravenous fotemustine 100 mg/m2 weekly for 3 weeks or DTIC 250 mg/m2/d for 5 consecutive days every 4 weeks (two cycles). Nonprogressive patients received a maintenance treatment every 4 weeks (fotemustine 100 mg/m2 or DTIC 250 mg/m2 for 5 days). RESULTS: Two hundred twenty-nine patients were randomly assigned to fotemustine or DTIC arms. The best ORR was higher in the fotemustine arm than in the DTIC arm in the intent-to-treat population (n = 229; 15.2% v 6.8%; P = .043) and in full analysis set (n = 221) (15.5% v 7.2%; P = .053). Similar median durations of responses (5.8 months with fotemustine v 6.9 months with DTIC) and time to progression (1.8 v 1.9 months, respectively) were observed. In patients without BM at inclusion, the median time to BM was 22.7 months with fotemustine versus 7.2 months with DTIC (P = .059). Median survival was 7.3 months with fotemustine versus 5.6 months with DTIC (P = .067). The main toxicity was grade 3 to 4 neutropenia (51% with fotemustine v 5% with DTIC) and thrombocytopenia (43% v 6%, respectively). No significant difference was noted for quality of life between arms. CONCLUSION: ORR was higher in the fotemustine arm compared to the DTIC arm in first-line treatment of disseminated melanoma. A trend in favor of fotemustine in terms of overall survival and time to BM was evidenced.
Malignant melanoma (MM) is an aggressive tumor, since it is responsible for 65% of skin cancer deaths [1]. The incidence of melanoma has increased approximately 3-fold over the last 40 years. Distant metastases of MM are associated with a poor prognosis; the median survival time of patients with advanced disease, depending on the patients performance status as well as location and number of metastases, is only about 4 to 6 months [2]. At this stage of the disease, surgery is rarely curative, and radiotherapy is only palliative. Many mono- as well as poly-chemotherapeutic regimens have been tested in advanced melanoma, but the single-agent dacarbazine (DTIC) remains the standard chemotherapy [3] with response rates ranging from 11% to 25%. Complete responses were rare and short in duration (3 to 6 months). The median survival time ranged from 4.5 to 6 months [4-6]. No multiagent chemotherapy has yet proved superior to single-agent DTIC chemotherapy in phase III clinical trials [3,7,8]. Recently, no significant difference was evidenced between the efficacy of the novel oral alkylating agent temozolomide and that of DTIC in patients with advanced metastatic MM [9]. The chloroethyl-nitrosourea fotemustine was shown to be effective as single agent against MM with an overall response rate of 24% in a large phase II trial including 153 assessable patients [10]. The study showed substantial activity with respect to brain metastases [11]. The efficacy of fotemustine was confirmed in international phase II studies with objective response rates (ORR) ranging from 12% to 47% and median duration of responses ranging from 18 to 26 weeks [12-14]. Fotemustine was well tolerated, with myelosuppression as the main side-effect. The primary objective of the current study was to compare the overall response rate (ORR) of metastatic MM in patients with or without brain metastases treated with either fotemustine or DTIC as first-line therapy. Secondary objectives included comparisons of time to progression (TTP), duration of response, time to occurrence of brain metastases in patients without brain metastases at baseline, health-related quality of life (QoL), safety profile, and overall survival.
Patients Adult patients (18 to 75 years old) with histologically confirmed disseminated non-ocular MM, with or without brain metastases, who met the following eligibility criteria were included in the study: At least one bidimensional measurable target, performance status (PS) 1, life expectancy greater than 3 months, adequate bone marrow function (WBC 4000/mm3; neutrophils 2000/mm3; platelet 100,000/mm3; hemoglobin 110 g/L), and satisfactory hepatic and renal functions (bilirubin within normal range, transaminases and alkaline phosphatase 2.5 x upper normal limit (UNL), or 2.6 to 5.0 x UNL in case of liver metastases for the latter parameter; creatinine < 1.5 x UNL). Patients were required to have had no prior chemotherapy or immunotherapy, except adjuvant immunotherapy completed at least 1 month before random assignment, no prior radiotherapy within the last 4 weeks before random assignment, no prior brain radiotherapy or apparently complete excision of brain metastasis, and in case of the presence of brain metastases those had to be unresectable. Local ethical review committees approved the study. All patients gave written informed consent before random assignment.
Treatment
Response and Toxicity Assessments For responder patients, response duration was calculated from the start of chemotherapy to the date of first observation of PD. TTP and time to occurrence of brain metastases (in patients without brain metastases at inclusion) were calculated from the date of random assignment to documentation of overall PD and date of first brain metastases, respectively. The severity of recognized adverse events (AE) were graded using National Cancer Institute Common Toxicity Criteria [16]. Other toxic effects were graded as mild, moderate, severe, or life-threatening.
Health-Related Quality of Life
Statistical Analysis A minimum of 102 patients per arm had to be included to allow a detection of 17% difference in ORR between treatments with 80% power at the 5% level of significance (two-tailed), assuming a response rate of 13% in the control arm. Response analyses were performed on the full analysis set (FAS, ICH-E9, 1997) and on the intent-to-treat (ITT) populations (defined as all randomly assigned patients). The QoL analyses were performed on the QoL population defined as all patients of the FAS who had assessable questionnaires at baseline and between baseline and end of induction treatment. Safety analyses were performed in all patients receiving at least one treatment infusion.
Patients From February 1998 to October 2000, 229 patients were randomly allocated to receive either fotemustine (n = 112) or DTIC (n = 117) in 19 centers from seven European countries. Five patients were not treated because of non-medical reason (all in the DTIC arm) and the remaining 224 patients were evaluated for safety analyses (112 in each arm). Three additional patients, who prematurely withdrew from the study without any postbaseline evaluation nor suspicion of PD, were also excluded from the FAS (two in the fotemustine arm and one in the DTIC arm). The remaining 221 patients (110 in fotemustine arm and 111 in DTIC arm) made up the FAS. Patients demographics were comparable in both treatment groups (Table 1).
Response Evaluation and Outcome The centralized radiologic committee reviewed 57 files. In responder patients, the discordance level between investigators and radiologic committee was low; 6% for fotemustine and 11% for DTIC group. In most cases, the radiologic committee evaluation was less favorable. Discordances were mainly because of the fact that PR or stable disease were not confirmed 4 weeks later.
Responses and Time to Progression The best ORR (ie, during maintenance treatments) was also higher in the fotemustine arm (15.5%) than in the DTIC arm (7.2%) in the FAS (P = .053; odds ratio = 2.35; 95% CI, 0.97 to 5.71; Table 2). CR occurred in three patients with fotemustine and one patient with DTIC. The probability of being responder (CR or PR) was higher in the fotemustine arm than in the DTIC arm after more than 3 months (26.5% v 16.4% at 3 months; 17% v 9% at 6 months; 9% v 0% at 12 months, respectively). In the ITT population, the best ORR was significantly higher in the fotemustine arm (15.2%) than in the DTIC arm (6.8%; P = .043; Table 2).
When considering the patients without brain metastases at inclusion (90 and 92 patients in the fotemustine and DTIC arms, respectively), the best ORR was significantly higher in the fotemustine arm (17.8%) than in the DTIC arm (7.6%) in the FAS (P = .040). In patients with brain metastases at baseline, the ORR was similar in both arms (5.0% v 5.3%, ie, one PR in each arm). The median durations of responses and TTP were similar in both arms (Table 2; Fig 1).
In patients without brain metastases at inclusion, 16 of 90 patients (18%) in the fotemustine arm and 21 of 92 patients (23%) in the DTIC arm had cerebral progression. The median time of occurrence of brain metastases was 22.7 months (95% CI, 9.62 to 23.33) in the fotemustine arm versus 7.2 months (95% CI, 6.28 to 11.70) in the DTIC arm (P = .059; Fig 2).
Survival At the time of analysis, the median overall survival was 7.3 months (95% CI, 6.01 to 8.84) in the fotemustine arm versus 5.6 months (95% CI, 5.03 to 6.54) in the DTIC arm (P = .067) in the ITT population (Fig 3). Similar results were obtained in the FAS. Twenty patients (18.2%) in the fotemustine arm were still alive versus 13 (11.7%) in the DTIC arm. An updated analysis performed in March, 2002, indicated that 11 patients were still alive in the fotemustine group (9.8%) versus eight (6.8%) in the DTIC group.
Safety A total of 108 patients (96%) in the fotemustine arm and 90 patients (77%) in the DTIC arm (P < .001) received complete induction treatment. The reasons of withdrawal before end of induction of the 26 patients were early progression (15 patients in the DTIC group and one patient in the fotemustine group) and occurrence of AE (seven patients in the DTIC group and three patients in the fotemustine group). Forty percent of patients (45 of 112) in the fotemustine arm versus 26% (30 of 117) in the DTIC arm received at least one maintenance treatment with a median number of 4 (range, 1 to 14) and 2 (range, 1 to 8), respectively. The treatment was modified (reduced dose and/or delayed) in 124 administrations (23%) for fotemustine and 67 administrations (5%) for DTIC, mainly as a result of hematologic toxicity in both arms.
Hematologic Toxicity
Nonhematologic Toxicity The most frequent nonhematologic AEs related to fotemustine therapy were nausea (20% of patients), vomiting (13%), asthenia (4.5%), and reaction at injection site (4.5%). One incidence of grade 3 vomiting and one of grade 4 somnolence (presence of hemorrhagic brain metastases) was observed (Table 4). The most frequent nonhematologic AEs related to DTIC therapy were nausea (17% of patients), vomiting (8%), fever (4%), and headache (4%). Severe toxicity included grade 3 nausea-vomiting and one grade 3 hepatotoxicity. Biologic hepatic and renal tolerance was acceptable in both groups (Table 3).
Health-Related QoL A total of 156 patients (83 for fotemustine v 73 for DTIC) were assessable for QoL at the end of the induction period. The reason for exclusion of the QoL population was no assessable QoL questionnaires at baseline (n = 19) or between baseline and end of the induction period (n = 48); one patient was excluded from FAS. A bias control using logistic stepwise regression with stepwise option was performed to measure bias on reason for exclusion from the QoL population. The PD and PS were the explicative variables predictive of patients selection to QoL evaluation. Progressive patients and patients with grade 2 to 4 PS were significantly more often excluded from QoL evaluation than nonprogressive patients (P < .0001) and patients with grade 0 to 1 PS (P = .0002), respectively. PD was the primary reason for discontinuing the QoL study. No significant differences between treatment groups were found for QoL (Table 5). QoL analysis was performed only for the induction treatment because of the high number of missing questionnaires in both arms and the small number of patients entering the maintenance treatment (47 in fotemustine arm v 29 in dacarbazine arm) with a low and unbalanced number of patients for the QoL analysis (24 v 10 patients, respectively, at the end of the first maintenance treatment). The general tendency in the selected QoL dimensions was degradation over time in both arms.
This European study enrolled 229 patients randomly assigned to receive either intravenous fotemustine (100 mg/m2 weekly for 3 weeks) or DTIC (250 mg/m2/d for 5 consecutive days every 4 weeks) according to the standard regimen for both compounds. The baseline clinical characteristics of the treatment groups were well balanced. The study populations, who had extended metastatic disease, were representative of candidates for first-line chemotherapy in clinical practice, a different situation from most published trials in MM which usually excluded patients with a suspicion of brain metastases. The results showed a best ORR two-fold higher in the fotemustine arm compared to the DTIC arm in the ITT population (15.2% v 6.8%; P = .043). The percentage of CR was three times higher in the fotemustine arm than in the DTIC arm. Interestingly, these CRs appeared during maintenance treatments in both arms (two CRs on day 134 and one CR on day 218 with fotemustine, and one CR on day 145 with DTIC). A subgroup analysis in the FAS showed that the best ORR was significantly higher in the fotemustine arm compared to the DTIC arm in patients without brain metastases at inclusion (P = .040). When considering response by metastatic sites, the percentages of objective responses were markedly higher in the fotemustine group than in the DTIC group for lymph nodes (15.9% v 8.3%), brain sites (5.9% v 0) and other visceral sites (12.1% v 6.3%) at the end of induction period. The best ORR obtained with fotemustine appeared lower than that reported in the pivotal phase II trial [10,11]. Similarly, the best ORR reported for DTIC was lower than that reported in two comparative randomized phase III trials: 12% in comparison with temozolomide [9], and 10% in comparison with the Dartmouth regimen [19]. These differences could be explained by a more extended disease at inclusion in the present study with a visceral-dominant involvement, which is known to be an unfavorable prognostic factor. Patients had a high tumor burden; 86% of them presented visceral metastases, including 19% of patients with evidence of brain metastases. Furthermore, a centralized radiologic review is commonly known to decrease the response rates. A relatively low percentage of cerebral responses was observed after treatment with fotemustine (5.9%) compared to those published earlier with fotemustine as single agent [10-14,20]. Results of five independent phase II studies with fotemustine as single agent therapy showed ORR in brain metastases of 21% (95% CI, 12% to 30%) in patients with MM [10-14]. Mornex et al [20] reported a brain ORR of 7% after induction treatment and a best cerebral ORR of 11% with fotemustine in a population of patients with unfavorable prognostic factors. No brain response was observed with DTIC in the present study, although its analog temozolomide recently yielded some responses in CNS metastases, either as single agent or in combination with thalidomide or radiotherapy [21-23]. Sixteen patients in the fotemustine arm and 21 in the DTIC arm developed cerebral metastases during the study period. The median time of occurrence of these brain metastases was about three times longer in the fotemustine group (22.7 months) than in the DTIC group (7.2 months; P = .059). Therefore, fotemustine did not decrease the number of relapses in brain sites, but a trend to a longer delay before CNS relapses was observed. Median overall survival time was prolonged in the fotemustine group as compared to the DTIC group (7.3 v 5.6 months in ITT population), but the difference was not significant (P = .067). Both drugs were well tolerated by patients and toxic effects were reversible, noncumulative, and manageable, and no toxic death was observed. As foreseen, grade 3 to 4 hematologic toxicity (except anemia) was more frequent in the fotemustine group with neutropenia and thrombocytopenia occurring in 51% and 43% of patients, respectively. The rate of severe hematotoxicity, which was mostly observed after the induction treatment, was comparable to the previously published data using the same treatment schedule [10,20]. No severe hemorrhagic syndrome was reported. In the case of nonhematological toxicities, nausea and vomiting were reported at a similar frequency in both groups with few cases of severe toxicity. Approximately 90% of the patients received preventive antiemetic treatment. Pain and fever were more frequently reported in the DTIC group than in the fotemustine group. One case of severe hepatotoxicity was noted in the DTIC arm. Comparison between groups should take into consideration that exposure to treatment was higher in the fotemustine group than in the DTIC group. No statistically significant difference between groups was evidenced for QoL during the induction treatment. The general tendency was degradation over time in both groups. The disease progression and PS alteration were the main factors for QoL impairment. Finally, two facts may have been at an unfair disadvantage for DTIC. Firstly, ORR results in the ITT population have to be considered, since five patients on the DTIC arm did not receive any treatment. Secondly, at the time of analysis, an unexpected confounding factor related to drug administration schedules was identified for the induction period. Whereas fotemustine total dose was delivered at once (ie, in the first 3 weeks) to patients allocated to this group, patients of the DTIC arm had a 24-day interval between the two cycles. It appeared that, at the time of the second cycle, PD was so evident in some patients that the treatment was stopped, although they had received only half of the intended dose during the induction treatment. Thus, the fotemustine administration schedule was more favorable in this group of melanoma patients with high tumor burden. In conclusion, the present study shows that fotemustine treatment is associated with a significant improvement in best ORR compared to DTIC treatment in patients with MM. A trend in favor of fotemustine was also evidenced in terms of overall survival and time to occurrence of brain metastases. Both treatments were well tolerated with reversible and manageable hematologic toxicities, and no difference between treatment groups was noted for QoL. This phase III study confirms the activity of fotemustine as single agent in first line treatment of MM.
The authors indicated no potential conflicts of interest.
This work was supported by the Institut de Recherches Internationales Servier, Courbevoie, France. This work was presented at the Annual Meeting of the American Society of Clinical Oncology, May 18-21, 2002, Orlando, FL. Authors disclosures of potential conflicts of interest are found at the end of this article.
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Copyright © 2004 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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