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Increased recurrences using intensity-modulated radiation therapy in the postoperative setting.
Aruna Turaka1, Tianyu Li, Navesh K Sharma
1Departments of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, PA 19111, USA.
American Journal of Clinical Oncology
|November 11, 2010
Summary
Intensity modulated radiation therapy (IMRT) for head and neck cancer showed higher local and regional failures in postoperative therapy (PORT) patients. Marginal failures were more common in the PORT group, indicating a need for careful treatment planning.
Area of Science:
- Radiation Oncology
- Head and Neck Cancer
- Medical Physics
Background:
- Intensity modulated radiation therapy (IMRT) is a common treatment for head and neck cancer.
- Understanding failure patterns after IMRT is crucial for improving patient outcomes.
Purpose of the Study:
- To investigate the patterns of treatment failure in head and neck cancer patients receiving IMRT.
- To identify factors associated with different types of failures, including local, regional, and marginal recurrences.
Main Methods:
- A retrospective analysis of 176 head and neck cancer patients treated with IMRT.
- Evaluation of tumor and nodal stage, smoking history, definitive versus postoperative radiation therapy (PORT), chemotherapy, and RT duration.
- Patterns of failure, including local (LF), marginal, and regional failures, were assessed based on dose prescription to planning target volumes (PTV1 and PTV2).
Main Results:
- Three-year local and locoregional (LR) failure rates were 9% and 16%, respectively.
- Failures were more frequent in the PORT cohort, with 5 of 8 local failures and all 3 marginal failures occurring in this group.
- Postoperative radiation therapy (PORT) was the only predictor of local failure (LF) on univariate analysis (P = 0.06).
Conclusions:
- Postoperative radiation therapy (PORT) is associated with a higher incidence of local and regional failures in head and neck cancer patients treated with IMRT.
- An increased risk of marginal failures was observed in the PORT group, suggesting potential challenges in achieving adequate dose coverage in the postoperative setting.
