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Journal of Clinical Oncology, Vol 23, No 27 (September 20), 2005: pp. 6730-6738
© 2005 American Society of Clinical Oncology.
DOI: 10.1200/JCO.2005.16.790

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Randomized Trial of Radiotherapy Versus Concurrent Chemoradiotherapy Followed by Adjuvant Chemotherapy in Patients With American Joint Committee on Cancer/International Union Against Cancer Stage III and IV Nasopharyngeal Cancer of the Endemic Variety

Joseph Wee, Eng Huat Tan, Bee Choo Tai, Hwee Bee Wong, Swan Swan Leong, Terence Tan, Eu Tiong Chua, Edward Yang, Khai Mun Lee, Kam Weng Fong, Hoon Seng Khoo Tan, Kim Shang Lee, Susan Loong, Vijay Sethi, Eu Jin Chua, David Machin

From the Departments of Radiation Oncology and Medical Oncology, National Cancer Center; Centre for Molecular Epidemiology and Department of Community, Occupational and Family Medicine, National University of Singapore; and Clinical Trials and Epidemiology Research Unit, Singapore

Address reprint requests to Joseph Wee, MD, Department of Radiation Oncology, National Cancer Center, 11 Hospital Dr, Singapore 169610, Republic of Singapore; e-mail: trdwts{at}nccs.com.sg

PURPOSE: The Intergroup 00-99 Trial for nasopharyngeal cancer (NPC) showed a benefit of adding chemotherapy to radiotherapy. However, there were controversies regarding the applicability of the results to patients in endemic regions. This study aims to confirm the findings of the 00-99 Trial and its applicability to patients with endemic NPC.

PATIENTS AND METHODS: Between September 1997 and May 2003, 221 patients were randomly assigned to receive radiotherapy (RT) alone (n = 110) or chemoradiotherapy (CRT; n = 111). Patients in both arms received 70 Gy in 7 weeks using standard RT portals and techniques. Patients on CRT received concurrent cisplatin (25 mg/m2 on days 1 to 4) on weeks 1, 4, and 7 of RT and adjuvant cisplatin (20 mg/m2 on days 1 to 4) and fluorouracil (1,000 mg/m2 on days 1 to 4) every 4 weeks (weeks 11, 15, and 19) for three cycles after completion of RT. All patients were analyzed by intent-to-treat analysis. The median follow-up time was 3.2 years.

RESULTS: Distant metastasis occurred in 38 patients on RT alone and 18 patients on CRT. The difference in 2-year cumulative incidence was 17% (95% CI, 14% to 20%; P = .0029). The hazard ratio (HR) for disease-free survival was 0.57 (95% CI, 0.38 to 0.87; P = .0093). The 2- and 3-year overall survival (OS) rates were 78% and 85% and 65% and 80% for RT alone and CRT, respectively. The HR for OS was 0.51 (95% CI, 0.31 to 0.81; P = .0061).

CONCLUSION: This report confirms the findings of the Intergroup 00-99 Trial and demonstrates its applicability to endemic NPC. This study also confirms that chemotherapy improves the distant metastasis control rate in NPC.

Supported by The National Medical Research Council of Singapore.

Presented in part at the 40th Annual Meeting of the American Society of Clinical Oncology, New Orleans, LA, June 5-8, 2004.

Authors' disclosures of potential conflicts of interest are found at the end of this article.




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