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Dysphagia-optimised Intensity-modulated Radiotherapy Techniques in Pharyngeal Cancers: Is Anyone Going to Swallow it?
I Petkar1, S Bhide1, K Newbold2
1The Royal Marsden NHS Foundation Trust, London, UK; The Institute of Cancer Research, London, UK.
Clinical Oncology (Royal College of Radiologists (Great Britain))
|March 1, 2017
Summary
Dysphagia significantly impacts quality of life for pharyngeal cancer patients. While intensity-modulated radiotherapy (IMRT) aims to spare swallowing structures, evidence is lacking to support routine use of these dysphagia-optimized IMRT techniques.
Area of Science:
- Oncology
- Radiation Oncology
- Swallowing Disorders
Background:
- Dysphagia is a debilitating side effect of pharyngeal cancer radiotherapy, affecting patient quality of life.
- The rise of human papillomavirus-driven pharyngeal cancers in younger patients necessitates improved treatment strategies focusing on functional outcomes.
- Intensity-modulated radiotherapy (IMRT) offers potential for sparing critical swallowing structures like the pharyngeal constrictor muscles (PCM).
Purpose of the Study:
- To review the evidence for dysphagia-optimized radiotherapy (Do-IMRT) techniques in pharyngeal cancer management.
- To analyze the dose-response relationship between critical swallowing structures and late dysphagia.
- To discuss the ongoing DARS study (ISRCTN 25458988), a Phase III trial evaluating swallow-sparing strategies.
Main Methods:
- Literature review of studies investigating dose-response relationships for dysphagia.
- Analysis of reported dysphagia-optimized IMRT (Do-IMRT) approaches.
- Discussion of the design and objectives of the DARS Phase III randomized controlled trial.
Main Results:
- Current evidence lacks randomized data to confirm the clinical benefits of IMRT techniques that spare PCM.
- Uncertainty remains regarding the true efficacy of dosimetric gains from advanced radiotherapy technology.
- The DARS study is the first Phase III trial to prospectively investigate the impact of swallow-sparing strategies on long-term function.
Conclusions:
- Dysphagia-optimized IMRT techniques sparing pharyngeal constrictor muscles (PCM) cannot yet be recommended for routine practice due to insufficient randomized evidence.
- Future improvements in radiation delivery must be integrated with novel treatment paradigms and rehabilitation for personalized patient care.
- The DARS study is crucial for establishing evidence-based guidelines for swallow-sparing radiotherapy in pharyngeal cancer.
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