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Journal of Clinical Oncology, Vol 20, Issue 21 (November), 2002: 4285-4291
© 2002 American Society for Clinical Oncology

Phase III Randomized Trial Comparing Three Platinum-Based Doublets in Advanced Non–Small-Cell Lung Cancer

By G.V. Scagliotti, F. De Marinis, M. Rinaldi, L. Crinò, C. Gridelli, S. Ricci, E. Matano, C. Boni, M. Marangolo, G. Failla, G. Altavilla, V. Adamo, A. Ceribelli, M. Clerici, F. Di Costanzo, L. Frontini, M. Tonato for the Italian Lung Cancer Project

From the Department of Clinical and Biological Sciences, University of Torino, Turin; Division of Pneumo-Oncology V, C. Forlanini Hospital, Division of Medical Oncology B, Regina Elena Institute, and Division of Medical Oncology A, Regina Elena Institute, Rome; Division of Medical Oncology, Bellaria Hospital, Bologna; Division of Medical Oncology B, National Cancer Institute "G. Pascale" and Department of Endocrinology and Molecular and Clinical Oncology, Federico II University, Naples; Division of Medical Oncology, S. Chiara Hospital, Pisa; Division of Medical Oncology, S. Maria Hospital, Reggio Emilia; Division of Medical Oncology, S. Maria delle Croci Hospital, Ravenna; Division of Medical Oncology, S. Luigi and S. Curro Hospital, Catania; Department of Medical Oncology, University of Messina, Messina; Division of Medical Oncology, S. Giuseppe Hospital and Division of Medical Oncology, L. Sacco Hospital, Milan; Division of Medical Oncology, S. Maria Hospital, Terni; and Division of Medical Oncology, Policlinico Hospital, Perugia, Italy.

Address reprint requests to Giorgio V. Scagliotti, MD, University of Turin, Department of Clinical and Biological Sciences, Azienda Ospedaliera S Luigi, Regione Gonzole 10, 10043 Orbassano, Torino, Italy; email: scagliotti{at}ihnet.it


    ABSTRACT
 TOP
 ABSTRACT
 INTRODUCTION
 PATIENTS AND METHODS
 RESULTS
 DISCUSSION
 REFERENCES
 
PURPOSE: To evaluate whether two commonly used newer platinum-based regimens offer any advantage over vinorelbine-cisplatin (reference regimen) in response rate for patients with advanced non–small-cell lung cancer (NSCLC).

PATIENTS AND METHODS: Chemotherapy-naive patients were randomized to receive gemcitabine 1,250 mg/m2 days 1 and 8 plus cisplatin 75 mg/m2 day 2 every 21 days (GC arm), or paclitaxel 225 mg/m2 (3-hour infusion) then carboplatin (area under the concentration-time curve of 6 mg/mL·min), both on day 1 every 21 days (PCb arm), or vinorelbine 25 mg/m2/wk for 12 weeks then every other week plus cisplatin 100 mg/m2 day 1 every 28 days (VC arm).

RESULTS: Six hundred twelve patients were randomized to treatment (205 GC, 204 PCb, and 203 VC). Overall response rates for the GC (30%) and PCb (32%) arms were not significantly different from that of the VC arm (30%). There were no differences in overall survival, time to disease progression, or time to treatment failure. Median survival for the GC, PCb, and VC groups was 9.8, 9.9, and 9.5 months, respectively. Neutropenia was significantly higher on the VC arm (GC 17% or PCb 35% v VC 43% of cycles, P < .001), as was thrombocytopenia on the GC arm (GC 16% v VC 0.1% of cycles, P < .001). Alopecia and peripheral neurotoxicity were most common on the PCb arm, as was nausea/vomiting on the VC arm (P < .05).

CONCLUSION: Efficacy end points were not significantly different between experimental and reference arms, although toxicities showed differences. These findings suggest that chemotherapy in NSCLC has reached a therapeutic plateau.


    INTRODUCTION
 TOP
 ABSTRACT
 INTRODUCTION
 PATIENTS AND METHODS
 RESULTS
 DISCUSSION
 REFERENCES
 
CISPLATIN-BASED combination therapy is currently considered the most active treatment option for patients with locally advanced or metastatic non–small-cell lung cancer (NSCLC).1-3 The 1990s heralded the arrival of novel active drugs (gemcitabine, vinorelbine, taxanes, and topoisomerase I inhibitors) that, when combined with platinum compounds in the phase II setting, produced response and 1-year survival rates in excess of 50%.4 Four randomized clinical trials have definitively proven the superiority of different cisplatin-based doublets, including some of these newer agents, over cisplatin alone in terms of overall response rate and time to progressive disease5-8 and, in three of the trials, median survival time.5-7 Another group of randomized clinical trials compared newer doublets to older regimens (eg, cisplatin/epipodophyllotoxins, mitomycin/ifosfamide/cisplatin, or cisplatin/vindesine).9-14 In most of these studies, the newer doublets produced a significant increase in objective response rate that did not always translate into an improvement in time to progressive disease or overall survival.

Among the newer doublets, gemcitabine/cisplatin (GC) and paclitaxel/carboplatin (PCb) are now commonly used in clinical practice. Consequently, the Italian Lung Cancer Project, including 31 Italian institutions, conducted a randomized study in chemotherapy-naive patients with advanced, recurrent, and/or metastatic NSCLC in which the primary end point of overall response rate was compared between the two experimental arms, GC and PCb, and the reference arm, vinorelbine/cisplatin (VC).

Because of increased interest in the patient’s perception of disease symptoms, treatment side effects, and their functional significance, we also assessed quality of life (QoL) with a lung cancer–specific instrument, the European Organization for Research and Treatment of Cancer (EORTC) QLQ-C30-LC13.15


    PATIENTS AND METHODS
 TOP
 ABSTRACT
 INTRODUCTION
 PATIENTS AND METHODS
 RESULTS
 DISCUSSION
 REFERENCES
 
Patient Selection
Patients eligible for the study must have had locally advanced (stage IIIB with either pleural effusion or N3 supraclavicular nodal disease), recurrent, and/or metastatic (stage IV) NSCLC. The neoplastic disease must have been clinically assessable, as defined by objective imaging studies consistent with and supported by a pathologic (histologic or cytologic) diagnosis of NSCLC. The presence of at least one unidimensional measurable disease was mandatory and bidimensionally measurable disease was preferable. Although patients were required to be chemotherapy or immunotherapy naive, radiation therapy was permitted if concluded at least 4 weeks before entering the study (provided the irradiated site was not the only site of measurable disease), and prior surgery was allowed if the patient met all the other criteria specified. Patients were to have an Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2 and a life expectancy of at least 12 weeks. Additional eligibility criteria included adequate bone marrow reserve (WBC count >= 3.5 x 109/L, platelets >= 100 x 109/L, hemoglobin >= 10 g/L, and hematocrit >= 30%) and liver and renal function (creatinine < 1.5 times the upper limit of normal).

Patients were excluded from the study for active infection, symptomatic CNS metastases requiring emergency radiotherapy and/or corticosteroids, serious concomitant systemic disorders, second primary malignancy (except in situ carcinoma of the cervix or nonmelanomatous skin cancers), and severe cardiovascular diseases. Patients who were pregnant or breast-feeding were not entered onto the study.

Written informed consent was obtained from each patient before entering the study. The study was conducted under the approval of the appropriate ethical review boards and the guidelines for good clinical practice. The recommendations of the Declaration of Helsinki for biomedical research involving human subjects were also followed.

Study Design and Sample Size
The study was powered at 80% to detect a difference between the comparator arms (GC and PCb) and the reference arm (VC) in response rate. The sample size needed for this study was 600 patients randomized in equal proportions to one of three treatment arms. This sample size was determined using a significance level of 5% for alpha and 20% for beta to test the hypothesis that all treatment arms were equal versus the alternative hypothesis that the comparator arms improved the response rate by 15% compared with that of the reference arm.

The randomization was centrally performed and patients were stratified by three prognostic variables: disease stage (locally advanced v metastatic disease), performance status (baseline ECOG performance status of 0 or 1 v 2), and investigational site. Patients were balanced with respect to study treatment in each stratum and for each factor using the algorithm described by Pocock and Simon.16

Treatment Schedule
On the GC arm, patients received gemcitabine 1,250 mg/m2 intravenously (IV) days 1 and 8 and cisplatin 75 mg/m2 (with appropriate hydration and antiemetics) day 2 of a 21-day cycle. On the PCb arm, patients received paclitaxel 225 mg/m2 as a 3-hour infusion then carboplatin IV at a dose corresponding to an area under the concentration-time curve of 6 mg/mL·min, according to Calvert’s formula,17 both on day 1 every 21 days. On the VC arm, patients received vinorelbine 25 mg/m2 days 1, 8, 15, and 22 as a 30-minute intravenous infusion and cisplatin 100 mg/m2 IV (with appropriate hydration and antiemetics) day 1 every 28 days. After 12 weeks of treatment, vinorelbine was administered every other week.

Patients who reached stable disease received a maximum of six cycles of therapy, whereas patients demonstrating an objective response (complete or partial) continued treatment at the investigator’s discretion, for two additional courses, up to eight cycles. Patients who experienced progressive disease or unacceptable toxicity or who could not be administered drug for 6 weeks from the time of last treatment were discontinued from the study. Dose adjustments within a cycle were made on the basis of absolute neutrophil count and platelet counts measured on the day of therapy, and assessment of nonhematologic toxicities.

Baseline and Treatment Evaluations
Before entering the study, patients underwent a medical history and physical examination, tumor measurement of palpable or visual lesions, chest radiograph, full blood count, blood chemistries, urinalysis, ECG, vital signs, and calculated creatinine clearance. Additional prestudy assessments included radiologic tests (computed tomographic scan or magnetic resonance imaging) if necessary for tumor measurement or if clinical or laboratory data suggested evidence of disease in a site not assessable by other imaging modalities. The same assessment method used to determine disease status at baseline was used consistently for efficacy evaluation throughout the study.

Before each cycle, patients completed the EORTC QLQ-C30-LC13 and underwent a limited medical history, physical examination (including tumor measurements), and chest radiography. During each cycle, patients underwent blood chemistries on day 1 and a full blood count weekly. In addition, patients on the GC and VC arms had calculated creatinine clearance assessed on day 1 of each cycle. At the end of each cycle, patients were assessed for toxicity according to the National Cancer Institute common toxicity criteria version 2.0.

Before every other cycle, patients underwent radiologic imaging studies that assessed disease status. All patients who received at least two cycles of therapy were considered assessable for objective tumor response. Objective tumor response was evaluated per standard World Health Organization criteria. For unidimensionally measurable tumors, partial response was defined as a reduction from baseline of >= 70% of the greatest diameter of the tumor, and progressive disease was defined as an increase from baseline of more than 30%. All complete or partial responders were to be confirmed 4 weeks after the response was first documented. To validate objective responses, computed tomographic scans were subsequently submitted to an independent oncology review board.

The duration of an objective (complete or partial) response was measured from the time the response was first documented to the date of disease progression. Overall survival was measured from the date of randomization to the date of death. Time to treatment failure was defined as the period from time of randomization to disease progression or discontinuation because of death or drug-related toxicities. All randomized patients who entered the study were evaluated for safety.

Statistical Analysis
Intent-to-treat analyses were performed on data from all patients who entered the study and received treatment. Estimates of time-to-event end points were calculated using the Kaplan-Meier method18 and compared using the log-rank test. Responses were compared using Pearson’s {chi}2 test. The effects of baseline factors (performance status, brain metastases, squamous cell histology, number of metastatic sites, and disease stage) were assessed for time-to-event end points using Cox’s proportional hazards model and were assessed for response using logistic regression. Those factors that showed individual prognostic value in univariate models were assessed for joint prognostic value in a multivariate model. A final model was developed using a backward selection strategy. Treatment was added to the final model to assess its effect when adjusted for the presence of important prognostic factors.

Each scale from the EORTC QLQ-C30-LC13 instrument was analyzed using a one-way analysis of variance. Differences from baseline to the end of cycle 2 for each scale and whether this treatment difference was sustained at the end of cycle 4 were evaluated. If there was an overall treatment difference (P < .05), comparisons of each experimental arm with the control arm (VC arm) were performed.


    RESULTS
 TOP
 ABSTRACT
 INTRODUCTION
 PATIENTS AND METHODS
 RESULTS
 DISCUSSION
 REFERENCES
 
Patient Demographics and Disease Characteristics
A total of 612 patients entered the study between August 1998 and May 2000. Of these patients, three on the PCb arm and two on the VC arm were randomized but did not receive treatment. Patient demographics and disease characteristics at baseline for the 607 patients who received treatment (205 GC, 201 PCb, and 201 VC) were well balanced across treatment groups (Table 1). Most of the patients with stage IIIB disease had N3 involvement (30 GC, 35 PCb, and 35 VC), and only a few had pleural effusion.


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Table 1. Patient Demographics and Disease Characteristics
 
Response and Time-to-Event Measures
Tumor response data are listed in Table 2. Overall response rates for the GC (30%) and PCb (32%) arms were not significantly different from that of the VC arm (30%) (GC v VC, P = .982; PCb v VC, P = .747), although a greater percentage of patients on the VC arm (23%) were not assessable for tumor response assessment compared with the GC (13%) or PCb (14%) arms (P < .02). There were no significant differences between the experimental and reference arms in the median duration of response (GC 9.4 or PCb 8.7 months v VC 8.2 months, P > .14).


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Table 2. Response Rate
 
Overall tumor responses for the GC, PCb, and VC groups by disease stage were 39%, 24%, and 26%, respectively, for stage III disease; and 28%, 34%, and 31%, respectively, for stage IV disease. Respective overall response rates by patients with brain metastases were 32%, 52%, and 25%, respectively.

Efficacy outcomes for time-to-event measures are listed in Table 3. Median follow-up times for these analyses were 8.8 months (95% confidence interval [CI], 8.0 to 9.7 months) for GC, 9.3 months (95% CI, 8.2 to 10.2 months) for PCb, and 8.7 months (95% CI, 8.1 to 9.7 months) for VC. There were no differences between the experimental arms and the reference arm in overall survival, time to disease progression, and time to treatment failure. Figure 1 provides Kaplan-Meier curves by treatment arm for overall survival. Median survival times for the GC, PCb, and VC groups were 9.8, 9.9, and 9.5 months, respectively. Respective 1-year survival rates were 37%, 43%, and 37% (GC v VC, P = .484; PCb v VC, P = .105). At the time of the analysis, 450 patients (150 GC, 148 PCb, and 152 VC) had died, giving censoring rates for survival of 26.8%, 26.4%, and 24.4%, respec-tively. Kaplan-Meier curves for time to progressive disease and time to treatment failure by treatment arms are shown in Fig 2.


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Table 3. Summary of Time-to-Event Outcomes
 


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Fig 1. Overall survival curves for the GC, PCb, and VC arms.

 


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Fig 2. (A) Time-to-progressive-disease curves for the GC, PCb, and VC arms. (B) Time-to-treatment-failure curves for the GC, PCb, and VC arms.

 
The multivariate analysis indicated that a performance status (ECOG) of 2 and the presence of more than two metastatic sites were negative prognostic factors for overall survival, time to disease progression, and time to treatment failure. When adjusted for these factors, there was no effect of treatment on overall survival (hazard ratio [HR], 0.92 for GC and 0.87 for PCb), time to progressive disease (HR, 1.01 for GC and 0.96 for PCb), or time to treatment failure (HR, 0.91 for GC and 0.89 for PCb) (Table 3). The presence of brain metastases was excluded as an independent negative prognostic factor.

Toxicity
Grade 3/4 hematologic toxicities are listed by cycle in Table 4. For the GC and PCb arms, the percentages of cycles with grade 3/4 neutropenia (17% and 35%, respectively) and anemia (6% and 2%, respectively) were lower than the values in the VC group (43% and 7%, P < .001), whereas the incidences of grade 3/4 thrombocytopenia were higher in the experimental arms (16% and 3% v 0.1%, P < .001). No serious hemorrhagic events were noted on either arm. The number of patients with febrile neutropenia (one for GC, two for PCb, and six for VC) were low and similar across treatment groups, whereas packed RBC transfusions were significantly less on the PCb arm (P < .01). Percentages of patients who received platelet transfusions for each arm (GC 8%, PCb 2%, and VC 8%) were not consistent with the respective percentages reported for grade 3/4 thrombocytopenia.


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Table 4. Grade 3/4 Hematologic Toxicity by Percentage of Cycles and Percentage of Patients
 
When summarized by patient (Table 4), rates of neutropenia and thrombocytopenia were again significantly lower on the experimental arms compared with the VC arm (P < .05), whereas anemia showed a significant difference only for the PCb arm (lower than that of VC, P < .001). Grade 3/4 nonhematologic toxicities by patient (worst grade) are listed in Table 5. Nausea/vomiting was more common on the VC arm (13%) than in either of the other two arms (GC 7%, PCb 0.5%, P < .05). Incidences of alopecia (grade 1/2) and peripheral neuropathy (grades 1 to 3), which were highest on the PCb arm (52% and 30%, respectively), were significantly higher than those observed on the VC arm (11% and 7%, respectively, P < .05).


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Table 5. Worst Grade 3/4 Nonhematologic Toxicity (% of patients with toxicity)
 
During the first two cycles of therapy, 32 (5.2%) patients died because of drug-unrelated (n = 14; five GC, five PCb, and four VC) or drug-related (n = 18; eight GC, three PCb, and seven VC) causes. During the same period, eight episodes (one GC and seven VC) of grade 3 or 4 renal insufficiency were reported, whereas 17 (2.8%) serious adverse events (all vascular) classified by the investigators as moderate to severe were reported as follows: four episodes (one GC, two PCb, and one VC) of deep vein thrombosis, one massive pulmonary embolism (VC), three cerebral ischemias (all GC), three myocardial infarctions (one GC, one PCb, and one VC), and six cardiovascular arrests or failures (one GC, two PCb, and three VC).

Treatment Administration
A total of 115 patients (45 GC, 47 PCb, and 23 VC) completed study treatment. Most patients discontinued the study because of progressive disease (80 GC, 76 PCb, and 95 VC). The total number of cycles delivered for the GC, PCb, and VC arms was 825 (mean per patient, 4.0), 851 (mean per patient, 4.2), and 653 (mean per patient, 3.2), respectively. Patients on the VC arm had the highest percentages of dose reductions (17%) and omissions (19%), mainly because of hematologic toxicities. The percentages of reductions and omissions were 12% and 6% for GC and 13% and 0% for PCb, respectively. Actual dose intensities were 90.6% for gemcitabine, 100% for cisplatin (with gemcitabine), 77.4% for vinorelbine, 94.8% for cisplatin (with vinorelbine), 94.7% for paclitaxel, and 99.2% for carboplatin.

QoL
Compliance for completion of the EORTC QLQ-C30-LC13 at baseline was high, but at later cycles, the percentage of patients still receiving therapy and who completed the questionnaire decreased. On-study compliance rates are listed in Table 6.


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Table 6. On-Study Compliance With QoL Questionnaire (% of patients who completed questionnaire)
 
After two cycles of therapy, only six of the functional and symptom scales of the EORTC QLQ-C30-LC13 showed treatment differences: role functioning (patients’ ability to work or participate in leisure activities), fatigue, nausea/vomiting, anorexia, peripheral neuropathy, and alopecia. Further analysis showed that there were no statistical differences between the GC and VC arms. However, the PCb arm differed significantly from the VC arm, with role functioning, fatigue, nausea/vomiting, and anorexia favoring the PCb arm, and peripheral neuropathy and alopecia favoring the VC arm.

When the same analysis was conducted after four cycles of therapy, the only scales showing treatment differences were pain, nausea/vomiting, peripheral neuropathy, and alopecia. Further analysis showed a statistical difference between the GC and VC arms in peripheral neuropathy, which favored the GC arm. This analysis also showed statistical differences between the PCb and VC arms for pain, peripheral neuropathy, and alopecia, all of which favored the VC arm. The significant parameters from cycle 2 are plotted in Fig 3. These same parameters were also plotted for cycle 4 to show whether treatment differences were sustained. Only nausea/vomiting, peripheral neuropathy, and alopecia showed sustained treatment differences.



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Fig 3. Significant QoL parameters after two cycles with follow-up after four cycles. V2 and V4 for VC, G2 and G4 for GC, and P2 and P4 for PCb. #Role functioning values were inverted to reflect positive changes as worsening. *Significantly different (P < .05) from the control arm.

 
Poststudy Therapy
A total of 124 (20%) patients (43 GC, 47 PCb, and 34 VC) received radiotherapy, and 220 (36%) patients (76 GC, 76 PCb, and 68 VC) received chemotherapy after completing the study. For the GC arm, most recipients (75%) of poststudy chemotherapy received vinorelbine- or taxane-based therapy, and for the PCb and VC arms, most were treated with gemcitabine-based therapy (72% and 74%, respectively).


    DISCUSSION
 TOP
 ABSTRACT
 INTRODUCTION
 PATIENTS AND METHODS
 RESULTS
 DISCUSSION
 REFERENCES
 
In advanced NSCLC, cisplatin-based chemotherapy improves survival, palliates symptoms, and is cost effective. Despite these encouraging data, most physicians are far from considering chemotherapy a standard approach for their patients.

Two other large, adequately sized, cooperative-group studies, the ECOG 159419 and Southwest Oncology Group (SWOG) 950920 trials, have already explored the therapeutic potential of newer regimens in patients with advanced NSCLC. In the four-arm ECOG trial comparing combinations of GC, docetaxel/cisplatin, and paclitaxel (3-hour)/carboplatin to paclitaxel (24-hour)/cisplatin, survival rates on the experimental arms (7.4 to 8.2 months) were not significantly different from that of the control arm (7.8 months), except for time to progression for the GC arm, which was significantly higher than that in the control arm (4.2 v 3.4 months, respectively; P = .001). In the SWOG trial, a control regimen of VC was compared with a regimen of PCb equivalent to that of the ECOG study. Patient characteristics were essentially comparable to those of the ECOG trial. Again, no differences between arms in any efficacy end point were noted.

In this large, multicenter, randomized trial conducted by the Italian Lung Cancer Project, the comparison of two of the latest generation of doublets, GC and PCb, to the reference regimen of VC showed comparable activity in terms of overall response rate, median and 1-year survival, time to progression, and time to treatment failure. The higher response rates and improved median survival times of approximately 2 months compared with those of the ECOG and SWOG studies appear to be attributable to the lower percentage of stage IV patients included in our trial (about 80% for our study v 91% for ECOG 1594 and 89% for SWOG 9509).

Second-line therapy has been asserted as a possible explanation for the absence of any survival advantages observed between the experimental and reference arms of the ECOG 1594 and SWOG 9509 trials but, unfortunately, these data were not recorded in those trials. In our study, most of the patients who received front-line therapy on the PCb and VC arms combined received gemcitabine-based therapy at the time of relapse. Of the patients who received poststudy chemotherapy on the GC arm, half of the patients received taxanes and the other half received vinorelbine. The similarity among the three treatment arms in median time to treatment failure, time to progressive disease, and overall survival makes the possibility of any positive impact of second-line therapy questionable.

The overall toxicity profile on the VC arm was more pronounced than that of either experimental arm: a significantly higher proportion of patients were not assessable for response at cycle 2 (23% for VC v 13% for GC and 14% for PCb, P < .02) because of discontinuation attributable to adverse events or progressive disease. In addition, a lower percentage of patients on the VC arm completed four cycles or the full course of chemotherapy (40% and 25%, respectively, v 59% and 37% for GC and 62% and 46% for PCb).

Grade 3/4 neutropenia was more commonly documented with the VC regimen, and six of a total of nine episodes of febrile neutropenia were reported on this arm. Grade 3/4 thrombocytopenia was more frequent on the GC arm and was only detected at the weekly blood cell count assessment, but was not associated with any serious hemorrhagic events. Moreover, the incidence of thrombocytopenia for GC was substantially lower compared with that reported in previous trials using a 4-week schedule.11,12,20,21 The inconsistency between the thrombocytopenia and platelet transfusion data on each arm is not clear, but may reflect variable transfusion policies or skill level in the management of hematologic toxicities.

The PCb arm was associated with the highest incidences of alopecia (grade 1/2, 52% of patients) and peripheral neuropathy (grades 1 to 3, 30% of patients), as was the VC arm for nausea/vomiting (grade 3/4, 13% of patients). The latter toxicity could be related to the higher day-1 cisplatin dose (100 mg/m2) as opposed to the 75-mg/m2 dose administered on the GC arm, but these doses were chosen to ensure similar cisplatin dose intensities on both arms. On the PCb arm, peripheral neuropathy higher than grade 2 appeared cumulative, ranging from 17% at cycle 2 to 32% at cycle 6. The 7% rate of neurotoxicity (highest grade) reported on the PCb arm is similar to respective rates reported by SWOG (13%) and ECOG (10%) investigators using the same schedule.

QoL results showed little differences between the VC and GC arms. Although results after two cycles of therapy favored the PCb arm over the VC arm, results after four cycles favored the VC arm. Administration of the questionnaire at the end of the cycle may have failed to detect the effect of acute toxicities on QoL. In addition, decreased compliance may have limited the statistical power to demonstrate differences, particularly at later cycles. Other randomized studies have failed to show meaningful differences between treatment arms in QoL for similar reasons.10-12,20

The present study failed to demonstrate a therapeutic advantage of either experimental regimen over the reference regimen in terms of survival or response. This result is entirely in keeping with the results of the ECOG and SWOG trials, providing further evidence that all of these regimens remain reasonable choices for patients with advanced NSCLC. Even though the present trial failed to show any advantage in response rate, survival, or QoL for the two experimental arms, the VC arm demonstrated greater toxicity, a significantly lower percentage of assessable patients, and a lower mean number of cycles, despite the schedule modification used to limit the toxicity reported in previous randomized studies.9,20 These potential limitations may undermine the usefulness of VC as a reference arm for future trials. Alternative schedules of VC (ie, lower cisplatin doses or vinorelbine on days 1 and 8 every 3 weeks) require validation in the phase III setting.

It is quite likely that the efficacy of chemotherapy in NSCLC may have reached a plateau, underscoring the uncertainty of getting better results by adding a third drug or changing the sequence of the available active agents. New strategies involving combining chemotherapy with novel biologic agents appear promising. As several of these agents are currently being developed for NSCLC, the results of ongoing randomized trials are eagerly awaited.

APPENDIX
The appendix listing investigators and institutions is available online at www.jco.org.

The following investigators and institutions were actively involved in the trial: S. Novello and G. Selvaggi, Department of Clinical and Biologic Sciences, University of Torino, Turin; M. R. Migliorino, L. Poaluzzi, and R. Belli, Division of Pneumo-Oncology V, C. Forlanini Hospital, Rome; M. Lopez and P. Foggi, Division of Medical Oncology B, Regina Elena Institute, Rome; A. Maestri, F. Mazzoni, and A. Di Stefano, Division of Medical Oncology, Bellaria Hospital, Bologna; E. Barletta and M. L. Barzelloni, Division of Medical Oncology B, National Cancer Institute "G. Pascale," Naples; L. Galli and M. Antonuzzo, Division of Medical Oncology, S. Chiara Hospital, Pisa; A. R. Bianco and V. Damiano, Department of Endocrinology and Molecular and Clinical Oncology, Federico II University, Naples; L. Savoldi and V. Pajetta, Division of Medical Oncology, S. Maria Hospital, Reggio Emilia; F. Zumaglini, Division of Medical Oncology, S. Maria delle Croci Hospital, Ravenna; A. Papalardo, Division of Medical Oncology, S. Luigi and S. Curro Hospital, Catania; V. Adamo, Department of Medical Oncology, University of Messina, Messina; F. Cognetti, Division of Medical Oncology A, Regina Elena Institute, Rome; G. Belloni, Division of Medical Oncology, S. Giuseppe Hospital, Milan; S. Gasperoni, Division of Medical Oncology, S. Maria Hospital, Terni; E. Piazza and P. Candido, Division of Medical Oncology, L. Sacco Hospital, Milan; F. Gozzelino, Division of Pneumology, Infermi Hospital, Biella; O. Bertetto, Division of Medical Oncology, S. Giovanni Battista Hospital, Turin; F. Pucci and S. Salvagni, Medical Oncology Service, General Hospital, Parma; G. Cruciani and G. M. Turolla, Medical Oncology Service, Lugo; A. Santini, Division of General Medicine and Medical Oncology, St. Anna Hospital, Ferrara; E. Recaldin and V. Picece, Division of Medical Oncology, S. Cuore Hospital, Negrar (Verona); A. Favaretto, Division of Medical Oncology, Civile Hospital, Padova; G. Luporini, Division of Medical Oncology, St. Carlo Borromeo Hospital, Milan; A. Ravaioli, Division of Medical Oncology, Infermi Hospital, Rimini; S. Gardani and A. Ardizzoia, Division of Radiation Oncology, S. Gerardo Hospital, Monza; S. Cerutti, Division of Medical Oncology, University of Torino, Turin; V. Fosser, Medical Oncology Service, St. Bartolo Hospital, Vicenza; R. Felletti, Division of Pneumology, S. Martino Hospital, Genoa; A. Paccagnella, Division of Medical Oncology, Civile Hospital, Venice; E. Pasquini, Medical Oncology Service, Civile Hospital, Cattolica (Forli); L. Portalone, Division of Pneumology VI, Forlanini Hospital, Rome; G. Ferrara, Department of Pneumology I, "Vincenzo Cervello" Hospital, Palermo; R. Canaletti, Division of Medical Oncology, Civile Hospital, Piacenza; M. Aglietta, Division of Medical Oncology, Cancer Research Institute, Candiolo (Turin); P. Pronzato, Division of Medical Oncology, St. Andrea Hospital, La Spezia; and A.M. Mosconi, S. Darwish, and S. Porrozzi, Division of Medical Oncology, Policlinico Hospital, Perugia.


    ACKNOWLEDGMENTS
 
Supported by Eli Lilly and Company.

We thank Marco Pacini, Alfonso Gentile, Luca Marini, Roberta Pratolini, Mauro Caterino, Annamaria Hayden, Astra Liepa, Binh Nguyen, and Clet Niyizika for technical assistance, and Mary Alice Miller, PhD, for editorial assistance with the article.


    NOTES
 
Presented in part at the Thirty-Seventh Annual Meeting of the American Society of Clinical Oncology, San Francisco, CA, May 12-15, 2001.


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 RESULTS
 DISCUSSION
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Submitted February 13, 2002; accepted July 17, 2002.


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