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Journal of Clinical Oncology, Vol 24, No 31 (November 1), 2006: pp. 5025-5033 Published by the American Society of Clinical Oncology DOI: 10.1200/JCO.2006.06.1853 Randomized Phase II Study of Bortezomib Alone and Bortezomib in Combination With Docetaxel in Previously Treated Advanced NonSmall-Cell Lung Cancer
From the Winship Cancer Institute, Emory University School of Medicine, Atlanta; Atlanta Veterans Affairs Medical Center, Decatur, GA; University of Texas M.D. Anderson Cancer Center, Department of Thoracic/Head and Neck Medical Oncology, Houston; University of Texas Southwestern, Dallas, TX; Kansas City Oncology Hematology Group, DBA Kansas City Cancer Centers, Kansas City; Washington University, Medical Oncology, Barnard Cancer Center; St Louis University Health Sciences Center, St Louis, MO; Cedars-Sinai Comprehensive Cancer Center, Los Angeles, CA; Massachusetts General Hospital, Boston; Millennium Pharmaceuticals Inc, Cambridge, MA; Vanderbilt University-Clinical Trials Center, Nashville, TN; Sylvester Comprehensive Cancer Center, University of Miami School of Medicine, Miami, FL; University of Alabama at Birmingham Comprehensive Cancer Center, Birmingham, AL; Huntsman Cancer Institute, University of Utah, Salt Lake City, UT; University of Colorado Health Sciences Center, Aurora, CO; Carolinas Hematology-Oncology Associates, Blumenthal Cancer Center, Charlotte; Duke University Medical Center, Durham, NC; and Kimmel Cancer Center at Jefferson, Philadelphia, PA Address reprint requests to Joan H. Schiller, MD, University of Texas Southwestern, Division of Hematology/Oncology, 5323 Harry Hines Blvd, Dallas, TX 75390-8852; e-mail: joan.schiller{at}utsouthwestern.edu
Purpose To evaluate the efficacy and toxicity of bortezomib ± docetaxel as second-line therapy in patients with relapsed or refractory advanced nonsmall-cell lung cancer (NSCLC). Patients and Methods Patients were randomly assigned to bortezomib 1.5 mg/m2 (arm A) or bortezomib 1.3 mg/m2 plus docetaxel 75 mg/m2 (arm B). A treatment cycle of 21 days comprised four bortezomib doses on days 1, 4, 8, and 11, plus, in arm B, docetaxel on day 1. Patients could receive unlimited cycles. The primary end point was response rate.
Results A total of 155 patients were treated, 75 in arm A and 80 in arm B. Baseline characteristics were comparable. Investigator-assessed response rates were 8% in arm A and 9% in arm B. Disease control rates were 29% in arm A and 54% in arm B. Median time to progression was 1.5 months in arm A and 4.0 months in arm B. One-year survival was 39% and 33%, and median survival was 7.4 and 7.8 months in arms A and B, respectively. Adverse effect profiles were as expected in both arms, with no significant additivity. The most common grade Conclusion Bortezomib has modest single-agent activity in patients with relapsed or refractory advanced NSCLC using this schedule, with minor enhancement in combination with docetaxel. Additional investigation of bortezomib in NSCLC is warranted in combination with other drugs known to be active, or using different schedules.
Lung cancer is a major public health problem worldwide. It is the leading cause of cancer-related death in the United States and Europe,1,2 and 172,570 people in the United States were estimated to develop cancer of the lung and bronchus in 2005.1 The 5-year survival rate remains low at 15%.1 Nonsmall-cell lung cancer (NSCLC) accounts for 75% to 85% of lung cancers.3-5 The majority of NSCLC patients present with advanced, unresectable disease (stage IIIB/IV), which remains incurable.6 First-line treatment of advanced NSCLC has improved substantially during the last 10 years with the approval of vinorelbine, gemcitabine, paclitaxel, and docetaxel; doublet chemotherapy with one of these agents plus cisplatin or carboplatin is now the standard of care.7-10 Recently, data from a phase III trial have shown that addition of the antivascular endothelial growth factor monoclonal antibody bevacizumab to paclitaxel plus carboplatin extended survival in patients with advanced nonsquamous NSCLC.11 In second-line treatment, docetaxel is one of the standards of care,12,13 and has shown superiority to best supportive care in terms of survival and quality of life14,15 and better time to progression (TTP) and progression-free survival (PFS) than vinorelbine or ifosfamide.3 The antifolate pemetrexed was approved recently by the US Food and Drug Administration for second-line treatment of advanced NSCLC, after a phase III trial demonstrating overall survival comparable to docetaxel.16,17 The epidermal growth factor receptortyrosine kinase inhibitor, erlotinib, also recently gained US Food and Drug Administration approval after it was shown to produce superior survival compared with placebo in the salvage setting.18 Bortezomib (VELCADE; Millennium Pharmaceuticals Inc, Cambridge, MA, and Johnson & Johnson Pharmaceutical Research and Development, LLC, Raritan, NJ) is the first proteasome inhibitor to be approved and investigated in clinical trials. It is approved in the United States and Europe for treating multiple myeloma patients who have received at least one prior therapy, after phase II and III studies,19-21 and is being investigated in other hematologic malignancies22,23 and solid tumors.24-28 Proteasome inhibition affects the ubiquitin-proteasome pathway, disrupting protein homeostasis and resulting in cell-cycle disruption, inhibition of transcription factors such as nuclear factor kappa-B, and antiangiogenic effects, which ultimately affect tumor growth and proliferation, and result in apoptosis.6,29,30 Bortezomib has a novel cytotoxicity profile in National Cancer Institute (NCI) in vitro and in vivo assays,31 and has demonstrated preclinical activity in NSCLC tumor cell lines as a single agent32-35 and in combination with other chemotherapy agents.34,36-38 Bortezomib plus docetaxel has demonstrated enhanced cytotoxic activity in preclinical studies in NSCLC30,39,40 and other solid tumors.41,42 Phase I and II studies of bortezomib alone24,27,43 and bortezomib plus docetaxel44,45 have indicated antitumor activity in solid tumors, and the regimens generally were well tolerated. These observations provided the rationale for this phase II study, which was carried out to determine the efficacy and safety of bortezomib alone and bortezomib plus standard-dose docetaxel as second-line therapy in locally advanced and metastatic NSCLC patients.
Patients Institutional review boards at each study center approved the study; all patients provided written informed consent before undergoing any study-related procedures. Patients with histologically/cytologically confirmed inoperable, locally advanced (stage IIIB) or metastatic (stage IV) NSCLC, who had received one prior chemotherapy regimen for locally advanced or metastatic disease, were enrolled subject to these main inclusion criteria: age 18 years, measurable disease, Karnofsky performance status 70%, and life expectancy more than 3 months. Patients were excluded if they had previously received bortezomib or docetaxel; had grade 2 peripheral neuropathy, as defined by NCI Common Toxicity Criteria Version 2.0; received chemotherapy, radiation therapy, or major surgery within 4 weeks before enrollment; received monoclonal antibodies within 6 weeks before enrollment; had inadequate hematologic, renal, or hepatic end-organ function; or had uncontrolled brain metastases or CNS disease.
Study Design In both treatment arms, a treatment cycle was 21 days long and comprised four bortezomib injections (3- to 5-second intravenous push) on days 1, 4, 8, and 11, followed by a 10-day rest period. Bortezomib dosing was 1.5 mg/m2 in arm A and 1.3 mg/m2 in arm B, selected based on the findings of phase I studies of bortezomib or bortezomib plus docetaxel in solid tumors.24,44,45 Arm B patients also received docetaxel 75 mg/m2 (1-hour infusion) on day 1 of each cycle, completed 1 hour before bortezomib administration, plus dexamethasone prophylaxis (six 8-mg doses administered orally during 3 days, commencing the night before planned docetaxel infusion). This dose of docetaxel has been shown to produce response rates of 5.5% to 8.8% in NSCLC.3,14,17 In both treatment arms, toxicities were managed using dose modifications and delays when necessary. Provided that treatment was well tolerated, patients could undergo an unlimited number of cycles until disease progression, complete response (CR), occurrence of an unacceptable adverse event (AE), death, or the meeting of any criterion for withdrawal from treatment. Following confirmation of a CR, patients were to remain on treatment for two additional cycles.
Efficacy, Safety, and Other Measurements Patients were evaluated at scheduled visits during screening, treatment, and long-term follow-up. At screening, a complete medical history, including chest x-ray and ECG, was obtained; a physical examination was conducted; laboratory samples were collected for hematology, clinical chemistry, and urinalysis; and target and nontarget lesions were identified and measured by computed tomography scan or magnetic resonance imaging. During treatment, assessments were conducted at twice-weekly visits (days 1, 4, 8, and 11) during the first 6 weeks, then weekly (days 1 and 8) until the end of treatment. Safety and efficacy evaluations conducted during treatment included symptom-directed physical examinations, Karnofsky performance status determination, and laboratory analyses. All AEs were documented; toxicities were graded according to NCI Common Toxicity Criteria Version 2.0. Every 6 weeks, patients target and nontarget lesions were assessed radiographically at the study site and objective overall tumor response was assessed using RECIST guidelines. In addition, scans from patients identified by investigators as having a response were reviewed at a central contract research organization. It was not intended for an independent radiologist to review all scans. After withdrawal from treatment, patients were observed for disease and survival assessment every 3 months until death. Patients who withdrew before disease progression were observed every 6 weeks, when possible, until disease progression, and then every 3 months until death.
Statistical Methods
Patient Demographics and Disposition Of 158 randomly assigned patients, 155 received at least one dose of study drug; 75 in arm A and 80 in arm B. The two treatment arms were comparable with respect to patient and disease characteristics, number and type of prior therapies, and best response to last prior chemotherapy (Table 1). All patients had received one prior line of chemotherapy for locally advanced or metastatic disease except one patient in arm A, who had received only gefitinib before study entry. This patient was not among those responding to treatment. Exposure to bortezomib and reasons for study termination were comparable between treatment arms (Table 2). Figure 1 shows exposure to treatment in both arms. Bortezomib dose reductions and interruptions were more common in arm B (31% and 70%, respectively) than arm A (9% and 51%, respectively).
Efficacy Overall response rate (CR + PR) as assessed by investigators was 8% (90% CI, 3.5% to 15.2%) in arm A and 9% (90% CI, 4.2% to 15.8%) in arm B (Table 3). Time to response was 36 to 83 days in arm A, with five of six patients responding within 40 days, and 38 to 99 days in arm B, with two of seven patients responding within 41 days. Of six patients who achieved PR in arm A, best responses to prior therapy were two CRs, one PR, two with stable disease (SD), and one progressive disease (PD). Best responses to prior therapy in arm B were one PR, four with SD, and two with PD. Central radiology review of scans from patients with investigator-assessed responses confirmed one PR in each arm and assessed four PRs in arm A and six PRs in arm B as SD, with one PR in arm A classified as not assessable according to quality criteria.
In total, 88 patients received additional therapy after study drug discontinuation, including 48 of 75 (64%) in arm A and 40 of 80 (50%) in arm B. The most common subsequent therapies were gefitinib (25% of patients in both arms), docetaxel (31% and 4% of patients in arms A and B, respectively), pemetrexed (11% and 6%, respectively), and gemcitabine (5% and 11%, respectively). Median TTP, duration of response, duration of disease control, survival, and PFS are listed in Table 3. Kaplan-Meier TTP and survival curves are shown in Figure 2. In an analysis in which subsequent treatment was censored, no changes in survival were seen. At last available follow-up, 80% of patients in arm A and 68% of patients in arm B had PD.
Safety As would be expected with this patient population, 99% of patients in each arm experienced at least one AE. The most commonly reported AEs in patients in arms A and B were fatigue (60% and 59%, respectively), nausea (53% and 55%, respectively), constipation (47% and 40%, respectively), diarrhea (40% and 41%, respectively), vomiting (40% and 35%, respectively), and dyspnea (35% and 31%, respectively). Neutropenia (5% v 59%), anemia (25% v 35%), pyrexia (16% v 30%), alopecia (5% v 25%), and dysgeusia (5% v 19%) were less commonly observed in arm A than in arm B, respectively. Conversely, thrombocytopenia (27% v 16%) and peripheral neuropathy (41% v 25%) were more commonly reported in arm A than in arm B, respectively. The most commonly reported drug-related AEs and grade 3 or 4 AEs are listed in Tables 4 and 5, respectively. Serious AEs of febrile neutropenia and neutropenia/neutropenic sepsis (each in four patients; 5%) were observed in arm B. No febrile neutropenia was reported in arm A.
There were 14 deaths reported during treatment or within 30 days of last dose of study treatment, which included six (8%) of 75 patients in arm A and eight (10%) of 80 patients in arm B. Of these deaths, 13 were assessed as unrelated to study treatment; one death in arm B was assessed as possibly related to treatment. This 79-year-old male patient, with a history of atrial fibrillation, received one dose of docetaxel and two doses of bortezomib before developing grade 3 hypotension, for which he was hospitalized. He suffered a cardiac arrest, from which he was resuscitated, and then suffered a second arrest, leading to death.
The results of this randomized, multicenter clinical trial indicate that bortezomib monotherapy has modest activity in relapsed or refractory advanced NSCLC, with an overall investigator-assessed response rate of 8%. Despite limited patient exposure (median, two cycles), this is comparable with single-agent response rates reported for other agents in second-line advanced NSCLC. Fossella et al3 and Shepherd et al14,40 reported response rates of 6.7% and 5.5%, respectively, in phase III studies of docetaxel 75 mg/m2, and in another phase III study, Hanna et al17 reported response rates of 9.1% and 8.8% for pemetrexed 500 mg/m2 and docetaxel 75 mg/m2, respectively. Our results are also comparable with the 8.9% response rate reported by Shepherd et al18 for erlotinib 150 mg in a phase III study in second- and third-line advanced NSCLC. Median overall survival of 7.4 months and 1-year survival probability of 38.7% with bortezomib monotherapy are also comparable to results from these studies. Median overall survival was 5.7,3 7.5,14 and 7.9 months17 for docetaxel, 8.3 months for pemetrexed,17 and 6.7 months for erlotinib18; 1-year survival probability was 32%,3 37%,14 and 29.7%17 for docetaxel, and 29.7% for pemetrexed.17 This study was noncomparative and not powered to demonstrate differences between treatment arms; however, bortezomib plus docetaxel seemed to demonstrate modest benefit compared with bortezomib monotherapy in terms of higher disease control rate, lower rate of PD, longer TTP, and longer PFS. Nevertheless, the combination of bortezomib plus docetaxel was not as active as might have been expected based on preclinical results; indeed, investigator-assessed response rate, disease control rate, median TTP, PFS, overall survival, and 1-year survival probability in arm B are consistent with data for single-agent docetaxel.3,14,17 This may be due to a number of factors. For example, the dose, schedule, or sequence of administration of the agents might not have been optimal, or there may have been negative interaction between the agents. The potential importance of sequence of administration has been indicated in preclinical studies. Gumerlock et al39 showed that, in vitro, docetaxel followed by bortezomib is more cytotoxic in the Calu-1 cell line than the alternative sequence; however, in vivo in the Calu-1 xenograft model, both sequences cause approximately 40% tumor growth inhibition, whereas simultaneous administration results in no tumor growth inhibition, potentially indicating antagonistic effects.40 In contrast, preliminary data from in vivo tumor model studies conducted at Millennium Pharmaceuticals show that coadministration in general provides optimal efficacy and does not reveal sequence dependency (Millennium Pharmaceuticals Inc, data on file). It should be noted that the significance of sequence of administration has yet to be verified in the clinical setting. An additional factor contributing to the lower-than-expected activity of the combination regimen may be that exposure to docetaxel was lower than in comparable studies; the median number of treatment cycles was just two, compared with three, four, and four in phase III studies of docetaxel 75 mg/m2.3,14,17 Similarly, initial bortezomib dose and mean dose density were lower in arm B than in arm A. Furthermore, a greater proportion of patients in this study had received prior paclitaxel (arm A, 67%; arm B, 70%) compared with the studies by Fossella et al (31% to 42%),3 Shepherd et al (0%),14 and Hanna et al (27.8%).17 In the study by Fossella et al,3 prior paclitaxel did not appear to affect efficacy, but in the study by Hanna et al,17 response rates to docetaxel in patients with CR/PR, SD, and PD to prior paclitaxel were 3.9%, 6.9%, and 4.0%, respectively, compared with the overall response rate of 8.8%. The safety of the combination regimen was similar to that expected, based on the known toxicities associated with bortezomib and docetaxel at the doses used in this study, and with routine use of dexamethasone.3,14 However, there was no evidence of additive toxicity, particularly neurotoxicity. The GI side effects of bortezomib were prominent in arm A and rate of dehydration was higher in arm A than arm B, perhaps owing to the lack of routinely prescribed prophylactic antiemetics; in contrast, patients in arm B received dexamethasone. As expected, myelosuppression, notably severe neutropenia, was more common in arm B than in arm A; four patients (5%) in arm B required hospitalization for febrile neutropenia compared with none in arm A. Peripheral neuropathy and thrombocytopenia, which are associated particularly with bortezomib, were more common in arm A, possibly owing to the higher initial bortezomib dose or higher mean bortezomib dose density. The confirmation of only two investigator-assessed responses by central radiology review is not easily understandable; however, differences between investigator-assessed responses and central radiology review have been observed in other clinical trials.47-49 It is important to note that response rate is not a good predictor for time-to-event parameters in lung cancer, and these data for bortezomib monotherapy are comparable with those for other approved single agents in this setting. In conclusion, bortezomib has single-agent activity in relapsed or refractory advanced NSCLC comparable to other approved second-line agents. Additional studies will be needed to determine the most efficacious way to combine this drug with other cytotoxic agents.
The following members of the 048 Study Group participated in this study: Wallace Akerley, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT; Rita Axelrod, Thomas Jefferson University, Philadelphia, PA; Robert Belt, Kansas City Oncology Hematology Group, DBA Kansas City Cancer Center, Kansas City; Ramaswamy Govindan, Washington University; Hans-Joachim Reimers, St Louis University Health Sciences Center, St Louis, MO; David Carbone, Vanderbilt-Ingram Cancer Center, Nashville, TN; Jeffrey Crawford, Duke Comprehensive Cancer Center, Durham, NC; Michael Fanucchi, Winship Cancer Institute, Emory University School of Medicine, Atlanta; Maria Ribeiro, Atlanta VA Medical Center, Decatur, GA; Panos Fidias, Dana-Farber Cancer Institute, Massachusetts General Hospital, Boston, MA; Robert Figlin, University of California at Los Angeles, Los Angeles; Ronald Natale, Cedars-Sinai Comprehensive Cancer Center, Los Angeles, CA; Frank Fossella, University of Texas M.D. Anderson Cancer Center, Houston, TX; Karen Kelly, University of Colorado Health Sciences Center, Aurora, CO; Steven Limentani, Carolinas Hematology-Oncology Associates, Charlotte, NC; John Murren, Yale University School of Medicine, New Haven, CT; Martin Oken, Hubert H. Humphrey Cancer Center, North Memorial Medical Center, Robbinsdale, MN; Luis Raez, Sylvester Comprehensive Cancer Center, University of Miami School of Medicine, Miami, FL; Francisco Robert, University of Alabama Comprehensive Cancer Center, Birmingham, AL; Joan Schiller, University of Wisconsin Comprehensive Cancer Center, Madison, WI.
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 ASCOs conflict of interest policy, please refer to the Author Disclosure Declaration and the Disclosures of Potential Conflicts of Interest section in Information for Contributors.
We thank John R. Murren for his contribution to the 048 study; we regret to report that he passed away last year. We also thank Steve Hill and Rosemary Washbrook (Gardiner-Caldwell London) for their assistance in drafting the manuscript, and Robert Figlin and Martin M. Oken, members of the 048 Study Group, for their contribution to patient enrollment.
Supported by Millennium Pharmaceuticals Inc and Johnson & Johnson Pharmaceutical Research & Development LLC. Presented in part at the 41st Annual Meeting of the American Society of Clinical Oncology, May 13-17, 2005, Orlando, FL, and the 11th World Conference on Lung Cancer (IASLC), July 3-7, 2005, Barcelona, Spain. Authors disclosures of potential conflicts of interest and author contributions are found at the end of this article. Published by the American Society of Clinical Oncology
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Copyright © 2006 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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