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Initial experience using intensity-modulated radiotherapy for recurrent nasopharyngeal carcinoma
Tai-Xiang Lu1, Wei-Yuan Mai, Bin S Teh
1Department of Radiation Oncology, Cancer Center, Sun Yat-Sen University, Guangzhou, People's Republic of China.
International Journal of Radiation Oncology, Biology, Physics
|February 18, 2004
Summary
Intensity-modulated radiotherapy (IMRT) is a feasible retreatment option for recurrent nasopharyngeal carcinoma (NPC). This study showed promising tumor control and acceptable toxicity, with 100% locoregional control at 9 months.
Area of Science:
- Radiation Oncology
- Medical Physics
- Oncology
Background:
- Recurrent nasopharyngeal carcinoma (NPC) after initial conventional radiotherapy (RT) presents a significant clinical challenge.
- Reirradiation strategies are crucial for improving outcomes in patients with recurrent NPC.
- Intensity-modulated radiotherapy (IMRT) offers advanced dose distribution capabilities for complex tumor sites.
Purpose of the Study:
- To evaluate the feasibility, toxicity, and tumor control of intensity-modulated radiotherapy (IMRT) for re-treating recurrent nasopharyngeal carcinoma (NPC).
- To assess the technical aspects and clinical outcomes of IMRT in a cohort of patients with previously treated NPC.
- To establish IMRT as a viable retreatment option for local recurrent NPC following initial conventional RT.
Main Methods:
- A total of 49 patients with locoregional recurrent NPC were treated with IMRT.
- Patients received a median prescription dose of 68-70 Gy to the nasopharyngeal gross tumor volume (GTV) and 60 Gy to positive lymph nodes.
- Dose constraints for critical structures were applied according to International Commission on Radiation Units and Measurements (ICRU) guidelines.
Main Results:
- IMRT achieved excellent target coverage, with 98.5% of the GTV receiving 95% of the prescribed dose (V(95-GTV)).
- At a median follow-up of 9 months, a 100% locoregional control rate was observed.
- Acute toxicities were acceptable, and tumor necrosis was noted in 28.6% of patients towards the end of treatment.
Conclusions:
- IMRT is a feasible and effective retreatment option for recurrent NPC, demonstrating improved target coverage and critical structure sparing.
- The initial tumor response and locoregional control rates are highly encouraging, with an acceptable toxicity profile.
- Further long-term follow-up is warranted to fully assess late toxicity and treatment outcomes for recurrent NPC reirradiated with IMRT.