Intensity-Modulated Radiation Therapy in the Salvage of Locally Recurrent Nasopharyngeal Carcinoma

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• 作者：Sufang Qiu ; M.D.^&lowast ; ; ^&dagger ; ; Shaojun Lin ; M.D.^&lowast ; ; Ivan W.K. Tham ; M.D.^&dagger ; ; Jianji Pan ; M.D.^&lowast ; ; Jun Lu ; M.D.^&lowast ; ; Jiade J. Lu ; M.D. ; M.B.A.^&dagger ; ; ^{mdcljj@nus.edu.sg}
• 关键词：Nasopharyngeal neoplasms ; Local recurrence ; Reirradiation ; Intensity-modulated radiation therapy ; Outcomes
• 刊名：International Journal of Radiation Oncology*Biology*Physics
• 出版年：2012
• 期刊代码：136_03603016
• 类别：med
• 出版时间：1 June, 2012
• 卷：83
• 期：2
• 页码：676-683
• 文件大小：904 K

摘要

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Purpose

Local recurrences of nasopharyngeal carcinoma (NPC) may be salvaged by reirradiation with conventional techniques, but with significant morbidity. Intensity-modulated radiation therapy (IMRT) may improve the therapeutic ratio by reducing doses to normal tissue. The aim of this study was to address the efficacy and toxicity profile of IMRT for a cohort of patients with locally recurrent NPC.

Methods and Materials

Between August 2003 and June 2009, 70 patients with radiologic or pathologically proven locally recurrent NPC were treated with IMRT. The median time to recurrence was 30 months after the completion of conventional radiation to definitive dose. Fifty-seven percent of the tumors were classified asrT3-4. The minimum planned doses were 59.4 to 60 Gy in 1.8- to 2-Gy fractions per day to the gross disease with margins, with or without chemotherapy.

Results

The median dose to the recurrent tumor was 70 Gy (range, 50-77.4 Gy). Sixty-five patients received the planned radiation therapy; 5 patients received between 50 and 60 Gy because of acute side effects. With a median follow-up time of 25 months, the rates of 2-year locoregional recurrence-free survival, disease-free survival, and overall survival were 65.8%, 65.8%, and 67.4%, respectively. Moderate to severe late toxicities were noted in 25 patients (35.7%). Eleven patients (15.7%) had posterior nasal space ulceration, 17 (24.3%) experienced cranial nerve palsies, 12 (17.1%) had trismus, and 12 (17.1%) experienced deafness. Extended disease-free interval (relative risk 2.049) and advanced T classification (relative risk 3.895) at presentation were adverse prognostic factors.

Conclusion

Reirradiation with IMRT provides reasonable long-term control in patients with locally recurrent NPC.