The dosimetric and clinical advantages of the GTV-CTV-PTV margins reduction by 6 mm in head and neck squamous cell carcinoma: Significant acute and late toxicity reduction
| Autor: | Abrahim, Al-Mamgani, Rob, Kessels, Tomas, Janssen, Arash, Navran, Suzanne, van Beek, Casper, Carbaat, Willem H, Schreuder, Jan-Jakob, Sonke, Corrie A M, Marijnen |
|---|---|
| Přispěvatelé: | Oral and Maxillofacial Surgery, Other Research |
| Rok vydání: | 2022 |
| Předmět: |
Locoregional control
Toxicity Squamous Cell Carcinoma of Head and Neck Radiotherapy Planning Computer-Assisted Radiotherapy Dosage VMAT Hematology HNSCC Oncology Head and Neck Neoplasms GTV-CTV-PTV margin reduction Humans Radiology Nuclear Medicine and imaging Radiotherapy Intensity-Modulated Radiation Injuries Radiometry Head and neck cancer |
| Zdroj: | Radiotherapy and oncology, 168, 16-22. Elsevier Ireland Ltd |
| ISSN: | 0167-8140 |
| DOI: | 10.1016/j.radonc.2022.01.013 |
| Popis: | Purpose: We aim to identify the dosimetric and clinical impact of reducing the total GTV-CTV-PTV margins in head-and-neck squamous cell carcinoma (HNSCC) treated with definitive (chemo)radiation. Materials and methods: The acute and late toxicity and outcomes of 155 consecutive patients treated between February 2017 and March 2019 with GTV-CTV-PTV margins of 9 mm were compared to those of 155 consecutive patients treated with total margin of 15 mm margin, before April 2015. All patients were treated with VMAT with daily-image guidance using CBCT. Results: Reducing the GTV-CTV-PTV by 6 mm resulted in significant reduction of total irradiated volume (PTV-total) by a median of 28.1% and significant reduction of doses to all salivary glands (largest reduction ipsilateral parotid gland; median −9.6 Gy) and constrictor muscle (−6.1 Gy) with subsequent reduction of the incidence of overall acute grade 3 toxicity (47.7% for 9 mm and 66.5% for 15 mm groups, p = 0.001), grade 3 mucositis (18.1% vs. 35.5%, p < 0.001) and feeding tube-dependency at the end of treatment (24.5% vs. 40%, p = 0.005). The incidence of late grade ≥ 2 xerostomia and dysphagia were also significantly lower in the 9 mm group (31.7% vs. 58.6% p < 0.001, and 15.4% vs. 26.7%, p = 0.04). The 2-year rates of loco-regional control, disease-free and overall survival were 78.8% vs.75.8%, 70.9% vs. 64.4%, and 83.8% vs. 67.6%, (p > 0.05, all). Conclusion: Reduction of the total GTV-CTV-PTV margins from 15 to 9 mm in HNSCC significantly reduced the irradiated volumes and the dose to salivary glands and constrictor muscle with significant reduction of radiation-related toxicity. The loco-regional control rates of both groups were comparable. |
| Databáze: | OpenAIRE |
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