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Originally published as JCO Early Release 10.1200/JCO.2008.18.1545 on December 8 2008 © 2009 American Society of Clinical Oncology. Randomized Phase II Trial of Concurrent Cisplatin-Radiotherapy With or Without Neoadjuvant Docetaxel and Cisplatin in Advanced Nasopharyngeal Carcinoma
From the Department of Clinical Oncology; Department of Diagnostic Radiology and Organ Imaging, Prince of Wales Hospital; State Key Laboratory in Oncology in South China, Sir Y.K. Pao Centre for Cancer, Hong Kong Cancer Institute; Center for Clinical Trials, School of Public Health, The Chinese University of Hong Kong; and Sanofi-aventis Hong Kong, Hong Kong SAR, China Corresponding author: Anthony T. Chan, MD, FRCP, Department of Clinical Oncology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, New Territories, Hong Kong SAR, China; e-mail: anthonytcchan{at}cuhk.edu.hk
Purpose To compare the toxicities, tumor control, survival, and quality of life of nasopharyngeal cancer (NPC) patients treated with sequential neoadjuvant chemotherapy followed by concurrent cisplatin-radiotherapy (CRT) or CRT alone. Patients and Methods Previously untreated stage III to IVB NPC were randomly assigned to (1) neoadjuvant docetaxel 75 mg/m2 and cisplatin 75 mg/m2 every 3 weeks for two cycles, followed by cisplatin 40 mg/m2/wk concurrent with radiotherapy, or (2) CRT alone. Planned accrual was 30 patients per arm to detect 20% difference of toxicities based on 95% CIs. Results From November 2002 to November 2004, 65 eligible patients were randomly assigned to neoadjuvant chemotherapy followed by CRT (n = 34) or CRT alone (n = 31). There was a high rate of grade 3/4 neutropenia (97%) but not neutropenic fever (12%) during neoadjuvant chemotherapy. No significant differences in rates of acute toxicities were observed between the two arms during CRT. Dose intensities of concurrent cisplatin, late RT toxicities and quality of life scores were comparable in both arms. The 3-year progression-free survival for neoadjuvant versus control arm was 88.2% and 59.5% (hazard ratio = 0.49; 95% CI, 0.20 to 1.19; P = .12). The 3-year overall survival for neoadjuvant versus control arm was 94.1% and 67.7% (hazard ratio = 0.24; 95% CI, 0.078 to 0.73; P = .012). Conclusion Neoadjuvant docetaxel-cisplatin followed by CRT was well tolerated with a manageable toxicity profile that allowed subsequent delivery of full-dose CRT. Preliminary results suggested a positive impact on survival. A phase III study to definitively test this neoadjuvant-concurrent strategy is warranted.
The current standard treatment for advanced nasopharyngeal cancer (NPC) is concurrent chemoradiotherapy with or without adjuvant chemotherapy.1,2 Randomized trials of neoadjuvant chemotherapy followed by RT alone have resulted in encouraging response rates and improvement in disease-free survival, but not overall survival.3-8 Because the use of chemotherapy in the neoadjuvant setting, or as concurrent therapy to RT, has been consistently shown to improve progression-free survival (PFS) and/or overall survival (OS) in advanced NPC, the development of a sequential schedule of neoadjuvant chemotherapy followed by chemoradiotherapy would seem a logical strategy to maximize the benefit from both approaches. In fact, this "neoadjuvant-concurrent" strategy has been pursued by several groups in uncontrolled phase II studies, with favorable outcome reported.9-11 The taxanes have demonstrated considerable single-agent activity in head and neck cancers and NPC.12-16 The combination of paclitaxel and carboplatin has yielded high response rates in the range of 59% to 75% in metastatic NPC,17,18 and has demonstrated encouraging activity and safety profile in the neoadjuvant setting of NPC.11 Docetaxel is associated with less neurotoxicity than paclitaxel and can therefore be more tolerably combined with cisplatin. Docetaxel and cisplatin in combination is highly active in head and neck cancer.19-21 Therefore, this combination was investigated in NPC and was expected to be highly active in the neoadjuvant setting. With the experience of a weekly cisplatin schedule from a completed phase III study of chemoradiotherapy in NPC22,23 and the evidence from other cancers that this may be the best tolerated schedule of chemoradiotherapy,24 the schedule of weekly cisplatin 40 mg/m2 for up to 8 weeks concurrently with RT was used in the present protocol. The primary objective of this study was to compare the toxicities of patients with advanced NPC treated with chemoradiotherapy with or without neoadjuvant docetaxel and cisplatin. Secondary objectives were to compare the tumor response, PFS, OS, and the quality of life of patients between the two treatment arms.
Patient Eligibility and Random Assignment Patients were eligible if they had biopsy-proven, previously untreated, locoregionally advanced NPC of International Union Against Cancer 1997 stages III to IVB. Other eligibility criteria included assessable disease, Eastern Cooperative Oncology Group performance status grade 0 or 1, age of at least 18 years, adequate bone marrow reserve (WBC count and platelet count of at least the lower limit of normal) and renal function (serum creatinine < 1.5x the upper limit of normal or creatinine clearance 50 mL/min), and absence of hypercalcemia or second malignancy. Patients were required to provide written informed consent before study entry. The study protocol was approved by the institutional review board and was conducted in accordance with the principles of the Declaration of Helsinki. The registration and randomization procedure were carried out by telephone from the central office of the Comprehensive Cancer Trials Unit of The Chinese University of Hong Kong (Hong Kong SAR, China) A computer program was used to generate the allocation list. Patients were stratified for stage (stage III v IV) and randomized with equal probability to one of the two treatment arms (Appendix Fig A1, online only): (1) neoadjuvant chemotherapy followed by CRT or (2) CRT alone.
Chemotherapy Chemotherapy was delayed by 1 week if the absolute neutrophil count (ANC) was less than 1.5 x 109/L or platelet count was less than 75 x 109/L. Both cisplatin and docetaxel were reduced to 65 mg/m2 if the nadir ANC was less than 0.5 x 109/L or platelet count was less than 50 x 109/L. No growth factor support was used. During CRT, cisplatin was delayed by 1 week if ANC was less than 1.5 x 109/L or platelet count was less than 75 x 109/L until the counts recovered. Cisplatin was stopped if there were any grade 4 toxicities. RT delays were strongly discouraged. Enteral tube feeding was used as required at the investigators discretion.
RT
Assessment and Follow-Up CBC, serum biochemistry, and adverse events were evaluated on days 1 and 10 of neoadjuvant chemotherapy and weekly during CRT, and were graded according to the National Cancer Institute Common Toxicity Criteria (NCI-CTC) version 2.0. Tumor response to neoadjuvant therapy was evaluated before commencement of CRT by nasopharyngoscopy, physical examination, and CT scan. Tumor response after CRT was evaluated by nasopharyngoscopy and biopsy, physical examination, and CT scan at 6 weeks after completion of CRT. Tumor response was classified according to WHO response criteria.26 Patients were followed up every 3 months in the first 2 years, then every 6 months in the third and fourth year, and yearly thereafter. The following assessments were performed at each follow-up visit: (1) history and physical examination, (2) nasopharyngoscopy, and (3) late RT toxicity of the skin, subcutaneous tissue, and salivary gland using the Radiation Therapy Oncology Group and European Organisation for Research and Treatment of Cancer (EORTC) late radiation morbidity scoring schema.27
Quality-of-Life Assessment
Statistical Analysis
OS was defined as the duration from the date of random assignment to the date of death resulting from any cause or censored at the date of last follow-up. PFS was defined as the duration from the date of random assignment to the date of disease progression or censored at the date of last follow-up. The survival analysis was based on intention-to-treat (ITT) principle and included all randomly assigned patients (ITT cohort, n = 65). Analysis of toxicities and responses was based on per-protocol treatment cohort (n = 60). The
Patients From November 2002 to November 2004, 68 patients were assessed and 65 were randomly assigned to one of the two study arms. Thirty-four patients were randomly assigned to the neoadjuvant chemotherapy arm and 31 patients to the control arm (Fig 1). The two treatment arms were well balanced in the baseline characteristics (Table 1). All patients in the neoadjuvant arm received the allocated treatment, but five patients in the control arm did not receive the allocated treatment. Of these five patients, two withdrew consent before treatment commencement, one was diagnosed to have dermatomyositis, one mandated IMRT mode of RT, and one required further investigation for lung lesion (which was later confirmed to be related to old tuberculosis on CT scan of thorax). Of the two patients who withdrew study consent after random assignment, one sought herbal medicine for 1 month and then received CRT. The other patient sought herbal medicine for 1 year before development of distant metastases and subsequently received palliative chemotherapy. All other three patients received CRT. All together, four of the five patients who withdrew from study received CRT as per standard institutional protocol, which was the same as the control arm to which they were originally allocated. All five patients were followed and included in the ITT analysis.
Treatment Administration All patients in the neoadjuvant arm completed the scheduled two cycles of neoadjuvant chemotherapy. The median duration from day 1 of cycle 1 to day 1 of cycle 2 neoadjuvant chemotherapy was 21 days (range, 21 to 27 days), and from day 1 of cycle 2 chemotherapy to day 1 of RT was 24 days (range, 20 to 28 days). The mean relative dose intensities of cisplatin and docetaxel during neoadjuvant chemotherapy and that of weekly cisplatin during CRT are shown in Figure 2. In the neoadjuvant arm, 100%, 97%, 94%, 88%, 74%, 35%, 7%, and 3% of patients completed 1, 2, 3, 4, 5, 6, 7, and 8 weeks of cisplatin during CRT, respectively. The corresponding numbers for the control arm were 100%, 96%, 92%, 84%, 76%, 48%, 20%, and 0%. The proportion of patients who completed cisplatin at different time points during CRT were comparable in the two arms (P = .94).
All patients in both arms completed RT to the prescribed dose. Twenty-nine percent in the neoadjuvant arm and 23% in the control arm were treated with IMRT plan. The mean RT total dose was 78.4 Gy (± 8.6 Gy) in the neoadjuvant arm and 76.5 Gy (± 7.4 Gy) in the control arm. The mean RT overall treatment time was 58.8 days (± 7.6 days) in the neoadjuvant arm and 56.6 days (± 6.6 days) in the control arm.
Acute Toxicity
Efficacy The responses after neoadjuvant chemotherapy and CRT are summarized in Table 3. After a median follow-up of 4.3 years, we observed a total of 20 disease progressions and 17 deaths in the ITT population. The pattern of failure according to treatment arm was summarized in Appendix Table A1 (online only). The 3-year PFS for the neoadjuvant versus control arm was 88.2% and 59.5% (hazard ratio =0.49; 95% CI, 0.20 to 1.19; P = .12; Fig 3A). The 3-year OS for the neoadjuvant versus control arm was 94.1% and 67.7% (hazard ratio = 0.24; 95% CI, 0.078 to 0.73; P = .012; Fig 3B).
We have repeated the survival analysis based on per-protocol treatment cohort by excluding the five patients who did not receive the allocated treatment. The result of this per-protocol analysis was similar to that for the ITT cohort. The 3-year PFS for the neoadjuvant chemotherapy versus control arm was 88.2% and 63.5% (hazard ratio = 0.55; 95% CI, 0.21 to 1.44; P = .23). The 3-year OS for the neoadjuvant chemotherapy versus control arm was 94.1% and 69.2% (hazard ratio = 0.26; 95% CI, 0.081 to 0.83; P = .022).
Late Toxicity
Quality of Life No significant difference was observed in the global quality-of-life scores in the two treatment arms. More information is provided in the Appendix.
Recently, there has been a renewed interest in the re-exploration of neoadjuvant chemotherapy in advanced NPC. This has resulted from two observations. First, there is the recognition that more effective neoadjuvant chemotherapy regimens may well exist. The second has been the observation that with the use of high-precision RT delivery such as with IMRT, coupled with the wide adoption of concurrent CRT, the local control rate in NPC has improved, and distant metastases has emerged as the predominant mode of treatment failures.25,30 Although no significant improvement in OS was seen in all the published neoadjuvant chemotherapy trials, the body of available clinical data strongly supports neoadjuvant chemotherapy in terms of improvement in PFS.3-8 Benefit has been seen in reduction of both local and distant failures.7 However, the selection and dosage of drugs may be crucial because an overly toxic schedule has been shown to impair the delivery of subsequent RT, and any possible benefit on survival may be offset by increased treatment-related mortality.4 A number of uncontrolled phase II studies,9,10,31,32 including our own report,11 have explored this sequential schedule of neoadjuvant chemotherapy followed by CRT approach in NPC. The results have been encouraging, and toxicity has been acceptable. Except for the feasibility of this approach, it is difficult to draw further conclusion from these uncontrolled phase II data. There is also concern about the additional toxicity, cost, prolonged treatment duration, compliance, and impact on late physical function and quality of life that could result from this approach. The results of the present randomized phase II study suggest that neoadjuvant docetaxel and cisplatin chemotherapy followed by CRT is a highly feasible sequential strategy for advanced NPC. The increased acute toxicity during the neoadjuvant chemotherapy was mainly hematologic (neutropenia and neutropenia fever) which was uncomplicated and manageable. Most importantly, this did not compromise the delivery of subsequent CRT. The hematologic toxicity could be further ameliorated with the use of growth factor support and prophylactic antibiotics. The comparable late toxicities and quality-of-life scores in both arms are encouraging. The preliminary results on pattern of failures suggest that the potential benefit of neoadjuvant chemotherapy is in the reduction of distant metastases (11.8% in the neoadjuvant arm v 23.1% to 29.0% in the control arm; Appendix Table A1). There is a suggestion of a positive impact on PFS and OS, although this needs to be confirmed in a definitive phase III trial. Recently, [18F]fluorodeoxyglucose positron emission tomography (PET) was compared with conventional staging procedures (ie, chest x-ray, abdominal ultrasound and bone scan) in the staging of advanced NPC, and it was suggested that PET may be more sensitive in detecting distant metastases.33,34 Sixty-three of the 65 patients enrolled in this trial also participated in a parallel study of PET-CT scan and tumor marker study.35 No distant metastases were detected on PET-CT after conventional staging procedures at study entry. Therefore, it would be unlikely that there was significant imbalance of occult distant metastases between the two treatment arms. Unlike the traditional cisplatin and fluorouracil combination, docetaxel and cisplatin combination can be conveniently administered as outpatient without the need for a central venous catheter device. A recent phase II study from The University of Texas M. D. Anderson Cancer Center (Houston, TX) has tested docetaxel and carboplatin combination as neoadjuvant therapy in NPC. Their result also confirmed that this regimen could be more conveniently administered in the outpatient setting and was devoid of serious nonhematologic toxicity.36 The triple combination of docetaxel, cisplatin, and fluorouracil (TPF) was compared with cisplatin and fluorouracil (PF) as induction chemotherapy in advanced head and neck cancer in the EORTC/TAX323 and TAX324 studies, and demonstrated superior PFS and OS.37,38 It was worth noting that in the TAX323 study, TPF induced more neutropenia (76.9%) than PF (52.5%), but did not lead to more frequent infectious complications when patients received prophylactic antibiotics. In the TAX324 study, patients in the TPF group had more G3/G4 neutropenia (83% in TPF v 56% in PF) and more febrile neutropenia (12% in TPF v 7% in PF), but there were fewer treatment delays in the TPF group. Similarly, no significant differences in the rate of adverse events during RT were observed in both studies. It should also be noted that in the aforementioned two neoadjuvant trials, neoadjuvant chemotherapy was administered in both arms, followed by RT alone in the EORTC/TAX323 study by Vermorken,37 or by concurrent carboplatin-RT in the TAX324 study by Posner.38 Our study adopted a pure concurrent CRT as control arm. We used weekly cisplatin during the CRT. However, any conclusion on tolerability of this schedule may not necessarily be extrapolated to the high-dose cisplatin regimen (100 mg/m2 every 3 weeks), another commonly used schedule in previous trials. It remains to be proven in head and neck cancer and in NPC whether the addition of any neoadjuvant chemotherapy regimen to concurrent CRT improves OS compared with concurrent CRT alone in a phase III setting.39,40 To answer the latter question, several phase III studies comparing a sequential approach of neoadjuvant chemotherapy followed by CRT versus CRT alone are ongoing in head and neck cancer.41,42 In NPC, a Radiotherapy Oncology Group for Head and Neck (GORTEC) multicenter phase III trial of neoadjuvant chemotherapy (TPF) followed by concurrent weekly cisplatin-RT versus weekly cisplatin-RT alone has been started.
Although all authors completed the disclosure declaration, the following author(s) indicated a financial or other interest that is relevant to the subject matter under consideration in this article. Certain relationships marked with a "U" are those for which no compensation was received; those relationships marked with a "C" were compensated. For a detailed description of the disclosure categories, or for more information about ASCO's conflict of interest policy, please refer to the Author Disclosure Declaration and the Disclosures of Potential Conflicts of Interest section in Information for Contributors. Employment or Leadership Position: Iris Chan, Sanofi-aventis (C) Consultant or Advisory Role: None Stock Ownership: None Honoraria: None Research Funding: None Expert Testimony: None Other Remuneration: None
Conception and design: Edwin P. Hui, Benny C. Zee, Anthony T. Chan Financial support: Iris Chan, Anthony T. Chan Administrative support: Frankie Mo, Rosalie Ho, Iris Chan, Benny C. Zee, Anthony T. Chan Provision of study materials or patients: Edwin P. Hui, Brigette B. Ma, Sing F. Leung, Ann D. King, Michael K. Kam, Brian K. Yu, Samuel K. Chiu, Wing H. Kwan, Rosalie Ho, Anil T. Ahuja, Anthony T. Chan Collection and assembly of data: Edwin P. Hui, Brigette B. Ma, Sing F. Leung, Ann D. King, Frankie Mo, Michael K. Kam, Brian K. Yu, Samuel K.Chiu, Wing H. Kwan, Rosalie Ho, Anil T. Ahuja Data analysis and interpretation: Edwin P. Hui, Brigette B. Ma, Sing F. Leung, Frankie Mo, Benny C. Zee, Anthony T. Chan Manuscript writing: Edwin P. Hui, Brigette B. Ma, Sing F. Leung, Benny C. Zee, Anthony T. Chan Final approval of manuscript: Edwin P. Hui, Brigette B. Ma, Sing F. Leung, Ann D. King, Frankie Mo, Michael K. Kam, Brian K. Yu, Samuel K. Chiu, Wing H. Kwan, Rosalie Ho, Iris Chan, Anil T. Ahuja, Benny C. Zee, Anthony T. Chan
Patients and Methods: Radiotherapy RT was planned and delivered by the Ho's technique. (Chan AT, Ma BB, Lo YM, et al: J Clin Oncol 22:3053-3060, 2004; Chan AT, Teo PM, Ngan RK, et al: J Clin Oncol 20:2038-2044, 2002). The same RT technique was used for both arms. The nasopharynx and adjacent region were treated to 66 Gy in 33 fractions over 6.6 weeks by a shrinking-field technique (two lateral facial-cervical ports to 40 Gy in 20 fractions over 4 weeks, followed by a three-port plan to another 26 Gy in 13 fractions over 2.6 weeks, with 6-MV photons). The cervical lymphatics were treated by a separate anterior photon port. For patients with parapharyngeal disease; a boost dose to the nasopharyngeal and parapharyngeal region was delivered by an ipsilateral posterolateral port, administering 20 Gy in 10 fractions over 2 weeks. Palpable residual nodes at completion of RT were boosted to 7.5 Gy in two fractions with an electron field. Patients with persistent NP disease at 6 weeks after completion of CRT received intracavitary brachytherapy using paired iridium-192 sources, delivering a dose of 18 Gy in four fractions in 15 days. Those with cytologically proven residual neck nodes were referred for radical neck dissection. From March 1, 2004, the protocol was amended to adopt IMRT to treat all T3/T4 disease in both arms. The prescribed dose was 66 Gy in 33 fractions in 6.6 weeks to the gross tumor volume with margins. Details of the IMRT technique used have been described previously. (Kam MK, Teo PM, Chau RM, et al: Int J Radiat Oncol Biol Phys 60:1440-1450, 2004).
Results: Quality of Life No significant difference was observed in the global quality-of-life scores in the two treatment arms (mean change in score was –8.59 at 4 weeks, 3.89 at 12 months, and 1.79 at 24 months in the neoadjuvant arm; and –4.00 at 4 weeks, 1.75 at 12 months, and 5.73 at 24 months in the control arm). Regarding physical functioning, patients in the neoadjuvant arm had slightly more deterioration at 4 weeks post-CRT (mean change score, –42.9 v –27.7; P = .0499), with increase in symptom score of appetite (mean change score, 18.6 v –5.3; P = .023) and constipation (mean change score, 24.5 v –3.8; P = .0075) compared with control arm. However, the differences in these items were no longer significant by 12 and 24 months post-treatment. No significant difference was observed in other QLQ-C30 function domains or symptom subscales between the two arms. In the H&N35 module, the only significant difference was an increase of nutritional supplements in neoadjuvant arm compared with control arm (mean change score, 10.0 v –23.5; P = .025) at 24 months post-treatment.
published online ahead of print at www.jco.org on December 8, 2008 Supported in part by a research grant from Sanofi-aventis Hong Kong Limited. Presented in part at the 41st Annual Meeting of the American Society of Clinical Oncology, May 13-17, 2005, Orlando, FL; the 13th European Cancer Conference, October 30-November 3, 2006, Paris, France; and the 43rd Annual Meeting of the American Society of Clinical Oncology, June 2-5, 2007, Chicago, IL. Authors disclosures of potential conflicts of interest and author contributions are found at the end of this article.
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Cancer Treat Rev 34:268-274, 2008[CrossRef][Medline] Submitted May 16, 2008; accepted August 18, 2008.
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Copyright © 2009 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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