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© 2002 American Society for Clinical Oncology Interferon Alfa Therapy for Malignant Melanoma: A Systematic Review of Randomized Controlled TrialsByFrom the Center for Evidence-Based Medicine, University of Oxford, Nuffield Department of Clinical Medicine, Oxford Radcliffe National Health Service Trust, Oxford, United Kingdom. Address reprint requests to Marko B. Lens, MD, Centre for Evidence-Based Medicine, University of Oxford, Nuffield Department of Clinical Medicine, Oxford Radcliffe NHS Trust, Oxford OX3 9DU, United Kingdom; email: markolens{at}aol.com
PURPOSE: No standard systemic adjuvant therapy has been proven to increase overall survival in melanoma patients. The effect of interferon alfa (IFN ) as a single agent or in combination has been widely explored in clinical trials. The purpose of this study was to assess the benefit of IFN therapy in malignant melanoma.
METHODS: We performed a systematic review of randomized controlled trials comparing regimens with or without IFN
RESULTS: Nine randomized controlled trials (RCTs) of IFN
CONCLUSION: In our review, results from included RCTs demonstrated no clear benefit of IFN
THE POOR PROGNOSIS OF metastatic melanoma has prompted researchers to search for an effective therapy after primary local and regional surgical interventions.1 The relative resistance of melanoma to a wide range of chemotherapeutic agents has also led clinical oncologists to test different postsurgical adjuvant therapies in patients with advanced melanoma.2,3 The concept of adjuvant therapy for melanoma is derived from the hypothesis that these therapies may have an effect on micrometastatic disease.4 There is no standard systemic adjuvant treatment with confirmed survival benefit for clinically node-negative stage I to II patients after excision of the primary melanoma, or for clinically node-positive stage III patients after regional lymphadenectomy.5,6
Interferons (IFNs) represent a family of glycoproteins with a broad spectrum of effects: antiviral, immunomodulatory, and antiproliferative effects, prodifferentiating and the antiangiogenic effect (this last mediated by the IFN-inducible protein IP-10).7,8 However, IFN alfa (IFN
Several trials have examined the role of IFN
Inclusion Criteria We included randomized controlled clinical trials assessing the use of IFN adjuvant therapy in high-risk melanoma patients. Patients had to have a clinically diagnosed cutaneous melanoma with no evidence of metastases in regional lymph nodes or at distant sites (stages I and II according to American Joint Committee on Cancer [AJCC] staging criteria) or with regional metastases (stage III). To be included in our review, a trial had to be carried out as a study of IFN monotherapy using only IFN . Studies were excluded if they used combination therapy or compared IFN treatment with some other form of systemic therapy.
Search Strategy
Data Extraction and Study Appraisal
We extracted the following data from each study: randomization process including strategy for concealment of allocation, number of randomized patients per each treatment arm, number of patients withdrawn from the study, duration of follow-up, and number of patients lost to follow-up. The main outcome measures were number of patients who relapsed, overall survival (OS), disease-free survival (DFS), and toxicity of the IFN Two reviewers independently extracted the data from each study. Once completed, any disagreements were resolved by consensus discussion. We designed a quality evaluation questionnaire (Table 1) and each trial was given a score with a maximum of 81 points.
Statistical Methods For each trial, we constructed 2 x 2 contingency tables for participants with outcome event with and without, separately, for the intervention group (patients randomized to IFN treatment) and the control group (patients randomized to observation). For each outcome of interest, we calculated relative risk reduction with 95% confidence interval (CI), absolute risk reduction with 95% CI, and number needed to treat (NNT) with 95% CI. For this calculation, we used Critically Appraised Topics software (CATmaker; NHS Research and Development Centre for Evidence-Based Medicine, Oxford, United Kingdom [http://cebm.jr2.ox.ac.uk]). We calculated odds ratios and 95% CIs for main outcomes using the Mantel-Haenszel method (using Cochrane Collaboration Review Manager 4.1; RevMan Development Team, The Nordic Cochrane Centre, Copenhagen, Denmark).
Study Characteristics We retrieved 1,127 articles reporting adjuvant therapy with IFN in melanoma patients. We identified nine randomized controlled trials comparing treatment with IFN with observation in melanoma patients.11-21 One trial21 did not fulfill our inclusion criteria.
Three of the studies were performed in the United States by the Eastern Cooperative Oncology Group (ECOG) and the North Central Cancer Treatment Group (NCCTG); six studies have been completed in Europe by the Austrian Malignant Melanoma Cooperative Group, the French Cooperative Group on Melanoma, the Scottish Melanoma Group, the United Kingdom Coordinating Committee on Cancer Research (UKCCCR), and the World Health Organization (WHO) Melanoma Program. Only two trials (French trial and WHO 16) had sufficient description of study design to suggest that adequate concealment of allocation had taken place; in other trials, methods for concealment of allocation were not reported or clear. Two types of IFN
The characteristics of patients in these randomized controlled trials are shown in Table 2. Examination of Table 2 reveals that the scheduled treatment with IFN
Three studies used high-dose IFN (ECOG 1684, ECOG 1690, and NCCTG), whereas others studies used low-dose IFN . Only three studies (Austrian, ECOG 1684, and ECOG 1690) had an induction phase, whereas others did not. In the Austrian study, an induction phase was defined as a 3-week course of daily low-dose IFN therapy with subcutaneous application, whereas the ECOG trials defined it as an intense short course of intravenous high-dose therapy 5 d/wk for 4 weeks.
The ECOG 1690 trial was the only three-arm randomized trial with two treatment groups: patients randomized to high-dose IFN Five trials (Austrian, ECOG 1684, ECOG 1690, Scottish, and WHO 16) reported that the outcome data were analyzed by intention to treat, whereas in other studies it was not clear. Quality assessment scores ranged from 22 to 71, with a mean score of 55.4 (95% CI, 53.8 to 57.0) (Table 3).
Patient Characteristics The total number of patients from the eight included trials was 3,178 (range, 96 to 654), of whom 1,701 were randomized to receive IFN treatment and 1,477 patients were randomized to observation.
The results for age, sex, Breslow thickness, disease stage (AJCC staging system for melanoma), Clark level, location of melanoma, histologic classification, presence of ulceration, and the number of metastatic regional lymph nodes were incompletely reported among all studies. The median age, reported in three trials,11,12,15 ranged from 49 to 55 years in the IFN
Disease Characteristics Although the balance between treatment arms for the disease stage was achieved in the NCCTG, ECOG 1684, and ECOG 1690 trials, disease stage was not consistent, as in these trials there were more patients with stage III melanoma. However, when evaluating survival in these trials, subgroup analysis was performed. The number of involved lymph nodes, once metastatic spread had occurred to the locoregional lymph nodes, was reported only in the ECOG 1690 trial. The patients in this three-arm trial were well balanced for this important prognostic feature. The NCCTG trial examined the extent of nodal involvement by dividing patients with regional metastasis into two groups: less than 20% of lymph nodes positive and more than 20% of lymph nodes positive. The WHO 16 trial included only patients with regional metastases and reported three groups of patients regarding the number of positive nodes. The Clark level was reported as a prognostic parameter in five trials, and the groups were well balanced for it.11-14,20 Histologic subtype classification and stratification of included patients according to this characteristic was reported in three trials (French, ECOG 1684, and ECOG 1690). Patient groups were well balanced. Although the ulceration is known to represent a very important prognostic parameter, only two ECOG trials performed randomization after stratification according to this prognostic factor. Excellent balance was achieved between groups, although the ECOG 1684 trial had almost five times more patients with no ulceration, whereas in the ECOG 1690 trial the proportion between patients with ulcerated and nonulcerated melanoma was 2:3. The sites of the melanoma as a prognostic factor was reported in five trials and the groups were well balanced.11-14,20
Follow-Up
Efficacy Outcomes
OS Our analysis was based on reported and available data for 2,771 participants from six trials. Median OS was reported in four studies (ECOG 1684, ECOG 1690, NCCTG, and Scottish) (Table 5). Only the ECOG 1684 trial reported statistically significant impact of IFN treatment on OS. We calculated the NNT for OS results for this trial, and it did not reach statistical significance. The French trial showed the trend toward extended OS.
DFS Our analysis was based on reported and available data for 2,020 participants from four trials. Median DFS was reported in four studies (NCCTG, ECOG 1684, ECOG 1690, and Scottish).
The ECOG 1684 trial reported statistically significant benefit in DFS for the patients treated with IFN
The French trial did not have the data regarding DFS, but reported the data on relapse-free interval showing that IFN
Relapse
The relapse rates ranged from 24% to 58.8% in IFN
Toxicity
The reduction in the dose of IFN
If dosage of the treatment was changed during the trial, the average IFN
Only one trial (the Scottish trial) reported the number of patients who completed the IFN The data regarding the most frequently occurring toxic events by type and degree were reported in five studies (French, ECOG 1684, ECOG 1690, NCCTG, and WHO 16). Drug-related death was reported in the ECOG 1684 trial in two patients (1.4%). No death related to therapy occurred in other studies.
Although two randomized controlled trials (ECOG 1684 and ECOG 1690, high-dose arm v observation) reported statistically significant benefit for DFS for patients treated with IFN as adjuvant therapy, our analysis confirmed this for only one included trial (ECOG 1684). For OS, the ECOG 1684 trial reported benefit for IFN , but our analysis did not confirm it, finding that no trial demonstrated statistical significance. On the basis of the results of the ECOG 1684 trial, the United States Food and Drug Administration in 1995 approved the use of high-dose IFN 2b as adjuvant treatment to surgery in patients at high risk of relapse.4
A common problem when reviewing clinical trials investigating the same problem is the great variation in study design, which makes it difficult to combine data and reach conclusions about overall results. The trials included in this review vary in many factors such as size, end points, patient selection, quality, type of therapy, treatment schedules and doses, and duration of treatment and follow-up. These differences within the IFN
At the 2001 annual meeting of the American Society of Clinical Oncology, Wheatly et al22 presented a meta-analysis of randomized controlled trials (RCTs) of IFN Prognosis for patients with melanomas with metastases is different from prognosis in those without nodal metastases. Survival probabilities for patients with intermediate- and high-risk melanoma range from 30% to 70%.23 Thus, adjuvant therapy trials involving such heterogeneous groups of patients are difficult to interpret.
The included trials were relatively small in size, and the majority of them had insufficient power to detect clinically and statistically important benefits for IFN
Because the IFN
Sentinel lymph node mapping was introduced as a procedure to select patients with occult metastases, which might be of importance for systemic treatment.26 Although patients with positive nodes after sentinel node biopsy are considered excellent candidates for IFN
RCTs on IFN
To establish the effect of IFN
There are several randomized trials underway, and results are awaited.29 Until all these trials are concluded, many dilemmas will remain. IFN
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Copyright © 2002 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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