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© 2000 American Society for Clinical Oncology Phase II Study of Vinorelbine in Patients With Malignant Pleural MesotheliomaFrom the Department of Medical Oncology, St Bartholomews Hospital, and the London Lung Cancer Group, London, United Kingdom. Address reprint requests to Jeremy P.C. Steele, MD, MRCP, Department of Medical Oncology, St Bartholomews Hospital, West Smithfield, London EC1A 7BE, United Kingdom; email j.p.steele@ mds.qmw.ac.uk.
PURPOSE: To evaluate the response rate and impact on quality of life of vinorelbine given as cycles of 30 mg/m2 weekly for 6 weeks to patients with malignant pleural mesothelioma. PATIENTS AND METHODS: Twenty-nine patients with histologically proven malignant pleural mesothelioma were enrolled (26 male patients and three female patients; median age, 58 years [range, 29 to 77 years]). Seventeen patients had epithelioid tumors, two had sarcomatoid tumors, and 10 had biphasic tumors. The International Mesothelioma Interest Group staging system was used: one patient had stage Ib disease, 10 had stage II disease, eight had stage III disease, and 10 had stage IV disease. Patients were treated with weekly injections of vinorelbine 30 mg/m2. A cycle consisted of six weekly injections. The new guidelines to evaluate the response to treatment in solid tumors were used. Responses were measured by spiral computed tomography scan. RESULTS: All twenty-nine patients had measurable disease and were assessed for response. There were seven partial responses (24% [95% confidence interval, 10% to 44%]), 16 patients had stable disease (55%), and six patients had disease progression on therapy (21%). The median number of vinorelbine injections was 12 (range, 2 to 30). Quality-of-life analyses showed a benefit for vinorelbine therapy. CONCLUSION: Vinorelbine shows promise in the palliation of patients with malignant pleural mesothelioma. The relatively low toxicity of the drug suggests that trials of vinorelbine in combination with other agents should be feasible.
MALIGNANT PLEURAL mesothelioma has been steadily increasing in incidence over the last 30 years, and the annual total in the United Kingdom is expected to increase to more than 3,000 from the present 1,300 cases.1 A continuing increase in new cases of malignant mesothelioma is also expected throughout the rest of Europe over the next 20 years,2 although the disease may have already peaked in the United States because of earlier control of asbestos use.3 Malignant pleural mesothelioma is generally considered to be resistant to therapy. Radical surgery is not possible for most patients. Palliative radiotherapy may provide pain relief but does not prolong survival.4 Most available chemotherapeutic agents have been evaluated in mesothelioma but no drug has consistently produced a response rate greater than 20%.5 Agents that have been reported to produce response rates of 10% to 20% include doxorubicin, epirubicin, mitomycin, cyclophosphamide, ifosfamide, cisplatin, carboplatin, and antifolates. Trials of combination chemotherapy have not demonstrated consistently greater response rates compared with single agents. There are no published randomized trials that demonstrate improved survival in patients treated with chemotherapy compared with supportive care.5 Vinorelbine is a semisynthetic derivative of vinblastine that is structurally modified on the catharanthine nucleus and is approved for treatment of nonsmall-cell lung cancer (as a single agent or in combination) and breast cancer. After intravenous (IV) administration, drug concentrations of vinorelbine in human lung are 300-fold greater than plasma levels and 3.4-fold to 13.8-fold higher than lung tissue concentrations achieved with vincristine.6 There are little data, however, on vinorelbine levels in pleural fluid. The usual dose of vinorelbine is 30 mg/m2 administered weekly or on days 1 and 8 of a 21-day cycle. Vinorelbine has demonstrated a high level of activity in preclinical studies compared with other vinca alkaloids.7 Vinorelbine is significantly more toxic to nonsmall-cell cancer cell lines and small-cell lung cancer cell lines implanted in nude mice as well as nonsmall-cell lung cancer cell lines in vitro.7 There are little data on the activity of vinorelbine against mesothelioma cell lines. In a phase II study in nonsmall-cell lung cancer, vinorelbine produced promising results in terms of response and time to progression (median, 34 weeks) and survival (median, 33 weeks).8 Le Chevalier et al9 reported a multicenter three-arm study in nonsmall-cell lung cancer in which vinorelbine was administered weekly at 30 mg/m2. The median number of administrations was 11, with 83% of doses being delivered on schedule. Other established clinical uses of vinorelbine include breast cancer and head and neck cancer. We conducted an single-center, open-label, phase II study of vinorelbine 30 mg/m2 administered weekly in patients with histologically proven malignant pleural mesothelioma with first radiologic assessment after 6 weeks of chemotherapy. The major end points were objective response to chemotherapy and quality of life.
Patients and Methods Between April 1998 to January 1999, patients with malignant pleural mesothelioma were enrolled onto a single-center trial of single-agent vinorelbine. The study had appropriate institutional ethical review board approval, and all patients provided written, informed consent according to institutional guidelines. All patients were required to have measurable, histologically confirmed, inoperable malignant pleural mesothelioma and to be 18 years old, with Eastern Cooperative Oncology Group performance status of 0 to 2 and no uncontrolled cardiac or hepatic disease. Patients with concurrent malignancies of another type (other than nonmelanoma skin cancer) were excluded. Hematologic and biochemical criteria included adequate bone marrow function (total leukocyte count 4 x 109 cells/L, platelet count 100 x 109 cells/L, and hemoglobin 10 g/dL), hepatic function (alkaline phosphatase 1.5 times the upper limit of normal). No prior chemotherapy was permitted. Prophylactic superficial irradiation of chest drain or biopsy scars was allowed before commencement of chemotherapy, provided that the patient had measurable disease outside the irradiated site. All patients had computed tomography (CT) chest scans performed at the time of enrollment. Where possible, pleural effusions were drained before commencing therapy. The International Mesothelioma Interest Group (IMIG) staging system was used.10 All treatment was administered on an outpatient basis. Vinorelbine (Navelbine; Pierre-Fabre Oncology, Paris, France) 30 mg/m2 to a maximum dose of 60 mg was administered in 20 mL of normal saline by IV injection into a peripheral vein over 5 minutes. No antiemetic was prescribed routinely. Treatment was given weekly, with each six administrations termed a cycle of therapy. Weekly complete blood cell counts and chemistry panels were performed. Treatment was delayed by 1 week in the event of bone marrow suppression (total leukocyte count < 3 x 109/L, neutrophil count < 1.5 x 109 cells/L, or platelet count < 100 x 109 cells/L). No provision for dose reductions was provided or required.
Assessment of Response The baseline sum longest diameter was used to characterize response as follows: complete response was defined as the disappearance of all target lesions, and partial response was defined as a decrease of at least 30% in the sum longest diameter. Responses were confirmed by repeat CT assessment not less than 4 weeks after criteria for response were first met. Responses that were not thus confirmed were classified as stable disease. Progressive disease was defined as an increase of at least 20% in the sum longest diameter, taking as reference the smallest sum longest diameter recorded since treatment started, or the appearance of one or more new lesions. A patient was considered to have stable disease if neither sufficient shrinkage to qualify for partial response nor sufficient increase to qualify for progressive disease had occurred, taking as reference the smallest sum longest diameter recorded since treatment started. The criteria had to be met at least once after the first six weekly treatments of vinorelbine. Duration of response was defined as the interval from the time that the criteria for partial response were first met to the time that criteria for progressive disease were first met, taking as reference the smallest sum longest diameter recorded since treatment started. Duration of stable disease was defined as the interval from start of treatment to the time that criteria for progressive disease were first met, taking as reference the smallest sum diameter recorded since treatment started.
Quality of Life
Statistical Considerations
Patient Characteristics Twenty-nine patients entered the study (Table 1); 26 were male and three were female. Histologic subtypes were as follows: epithelioid, 17 patients (59%); sarcomatoid, two patients (7%); biphasic, 10 patients (34%). IMIG staging was as follows: one patient (3%) had stage Ib disease, 10 patients (34%) had stage II disease, eight patients (28%) had stage III disease, and 10 patients (34%) had stage IV disease. Eastern Cooperative Oncology Group performance status (PS) of patients was as follows: PS 0, 13 patients (45%); PS 1, 11 patients (38%); PS 2, five patients (17%). Ten of the 29 patients had received prior superficial radiotherapy outside the area of measurable disease. Two patients received less than one full cycle of vinorelbine and had no follow-up CT scan assessment. Both patients died of progressive mesothelioma and were included in the response analysis as having progressive disease.
Tumor Response Twenty-nine patients entered the study between April 1998 and January 1999 were assessed for radiologic response. Of the 29 patients, there were seven partial responses (24%, [95% confidence interval, 10% to 44%]), 16 patients (55%) had stable disease, and six patients (21%) experienced disease progression on treatment. Responses were observed in all three histologic subtypes of mesothelioma (Table 2). Figure 1 shows sequential spiral CT chest scans from patient no. 21 in whom a partial response was documented. The median duration of response was 5.3 months and the median duration of stable disease was 4.6 months.
Quality of Life Quality of life was improved in the majority of patients. At first assessment after one cycle, 22 patients (76%) reported improved psychologic symptoms, 14 patients (48%) reported improved lung-related symptoms, and 12 patients (41%) reported improved general physical symptoms. Activity levels improved in five patients (17%) and worsened in 15 patients (52%). Twenty-three patients completed between one and two cycles of vinorelbine and were reassessed: 18 patients (78%) reported improved psychological symptoms, 12 patients (52%) reported improved lung-related symptoms, and 15 patients (65%) reported improvement in other physical symptoms. Activity levels improved in five patients (22%) and worsened in 13 patients (57%). Ten patients completed between two and three cycles of vinorelbine, of whom seven patients received three complete cycles or more. Six patients (60%) reported improved psychologic symptoms, five patients (50%) reported improved lung-related symptoms, and five patients (50%) reported improvement in other physical symptoms. Quality-of-life improvements were recorded in patients with stable disease as well as those with responses. Quality-of-life data after one and two cycles of vinorelbine according to response showed that the majority of responding patients had improved psychologic symptoms, physical symptoms, and lung-related symptoms, although overall activity levels were less. At these same time points, patients with stable disease showed a similar result, with improved psychologic symptoms, physical symptoms, and lung-related symptoms, but reduced activity levels. For the six patients with progressive disease, lung-related symptoms, general physical symptoms, and activity levels deteriorated, whereas psychologic symptoms were unchanged when assessed after one cycle. Overall quality-of-life data are shown in Fig 2.
Survival The median overall survival for the 29 patients from time of first treatment was 10.6 months and from time of first diagnosis was 13.8 months. The percentage of patients alive 1 year from time of first treatment was 41% (95% confidence interval, 24% to 58%; Kaplan-Meier) and the percentage alive 1 year from date of diagnosis was 55% (95% confidence interval, 36% to 71%; Kaplan-Meier).
Toxicity
We have shown that vinorelbine has useful clinical activity against malignant pleural mesothelioma. There were seven partial responses in 29 patients, giving a response rate of 24%. All seven radiologic partial responses were seen after the first cycle of chemotherapy and were seen in patients from each of the three main histologic subgroups, including those with sarcomatoid and biphasic tumors, which are generally considered more resistant to chemotherapy. Disease progression was the best initial response in six patients. Quality-of-life analyses demonstrated improvements in psychologic and physical indices for patients receiving treatment with vinorelbine. Patients who benefited reported reduction or resolution of pain, cough, and breathlessness as well as enhanced overall well-being. Symptom relief was maximal after two cycles of treatment and was seen in patients with radiologically stable disease as well as those with proven partial responses. Activity levels worsened in all patients whether their disease was responding, stable, or progressing. This finding can be attributed to the toxicity of chemotherapy and possibly the need to visit the hospital weekly for treatment. This would have to be a consideration when discussing the likely palliative benefit to an individual patient. The quality of life of patients who experienced disease progression on chemotherapy worsened, although it is not possible to know how much of this symptomatic deterioration was due to progressive mesothelioma and how much to the treatment. Other toxicities were generally low, with only one patient requiring admission for neutropenia-related infection. Mild constipation was a relatively common side effect reported mostly by patients on concomitant opioid analgesics. Constipation was usually easily controlled. Fatigue was reported by most patients, although it was never severe enough during the first two cycles of treatment to require cessation of therapy. Phlebitis at the site of injection, which generally resolved after three or four days, was reported in 10% of patients. In this trial, vinorelbine chemotherapy was administered by peripheral veins, and it is our view that the risk of phlebitis from weekly vinorelbine administration is insufficient to warrant the routine placement of tunnelled central lines. There was no significant nausea and vomiting or alopecia. The toxicities reported in this study are similar to those reported in the published data on vinorelbine used in nonsmall-cell lung cancer9 and breast cancer.15 The weekly schedule used in this trial was chosen empirically but was practical from the patients perspective. One explanation for the encouraging response rate and quality of life gains observed might be that this schedule is relatively dose-dense compared with other commonly used vinorelbine protocols. Approximately 1 weeks treatment out of each six-week cycle was delayed because of asymptomatic neutropenia. In patients with stable disease or partial responses, it was possible to continue therapy to three or more cycles. It is not possible in the context of a single-arm trial to establish whether overall survival had been prolonged by vinorelbine, but the median overall survival of 10.6 months (from time of commencement of vinorelbine therapy) is encouraging. It is unclear why vinorelbine is active in this disease when other vinca alkaloids and taxanes are not. The explanation could be that vinorelbine has a different pharmacology from the other microtubule agents,6,7 with the high drug levels demonstrated in human lung6 being particularly significant. Other groups have recently reported trials of newer cytotoxic agents in patients with malignant mesothelioma. The results have been mixed. Vogelzang et al16 used high-dose paclitaxel with granulocyte colony-stimulating factor in 35 patients with mesothelioma and reported a response rate of 9% in assessable patients. OReilly et al17 used carboplatin with interferon alfa-2a in patients with advanced mesothelioma and showed a response rate (7%) equivalent to that seen with single-agent carboplatin. The new antimetabolite, gemcitabine, has been evaluated by several groups. The Cancer and Leukemia Group B treated 17 patients with 1,500 mg/m2 of gemcitabine on days 1, 8, and 15 of a 28-day cycle.18 No partial responses were seen, and the median survival duration was 4.1 months. The European Organization for Research and Treatment of Cancer tested gemcitabine 1,250 mg/m2 on days 1, 8, and 15 of a 28-day cycle in 27 patients with malignant pleural mesothelioma, with an objective response rate of 7% and a median survival of 8 months.19 Byrne et al12 used gemcitabine 1,000 mg/m2 on days 1, 8, and 15 of a 28-day cycle in combination with cisplatin 100 mg/m2 to give a response rate of 47.6%, although hematologic toxicity was appreciable. Responses were assessed according to criteria similar to the new Response Evaluation Criteria in Solid Tumors guidelines,11 which we used to measure the responses to vinorelbine. The median survival from start of first treatment was 41 weeks, less than the 46 weeks in the present study. Combination chemotherapy can produce response rates greater than 20%, although toxicity accumulates often with no clear palliative gain. Recent data from Kasseyet et al20 reported a 38% response rate and a median survival time of 16 months in 45 patients treated with cisplatin, etoposide, fluorouracil, mitomycin, and growth factors. All patients were stage II and 33 (73%) of 45 patients in this trial had epithelioid histology, indicating a relatively favorable prognostic group. Data on quality-of-life benefits of chemotherapy are limited. Middleton et al21 reported symptom relief in 62% of patients treated with mitomycin, vinblastine, and cisplatin therapy, which produced a 20% partial response rate but a median survival of only 6 months. In common with our data, quality-of-life improvements were seen in patients without objective response as well as in those responding, although palliative benefit, if seen, came early in the treatment period. The results reported here suggest that vinorelbine is an active drug for the treatment of malignant pleural mesothelioma. In the United Kingdom, the Medical Research Council and British Thoracic Society will be commencing a three-arm randomized phase III trial comparing single-agent vinorelbine with mitomycin, vinblastine, and cisplatin and best supportive care to determine whether chemotherapy truly improves either quality or length of life in this disease. Other combinations of vinorelbine, platinum agents, and gemcitabine also warrant investigation.
We acknowledge the following physicians for administration of chemotherapy at local cancer centers: Drs M.G. Bond, J. Boote, M. Daly, D. Gilligan, and P. Fisher.
The authors acknowledge the support of Pierre-Fabre Oncology for subsidized drug costs.
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Copyright © 2000 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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