De-intensification of postoperative radiotherapy in head and neck cancer irrespective of human papillomavirus status - results of a prospective multicenter phase II trial (DIREKHT Trial)
Background: Current standard treatment concepts in head and neck squamous cell carcinoma (HNSCC) are based on former studies using 2D and 3D treatment plans. However, modern radiation techniques allow for a more precise and individual dose application. Therefore, in a clearly defined patient populat...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
19 August 2024
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| In: |
Frontiers in oncology
Year: 2024, Jahrgang: 14, Pages: 1-12 |
| ISSN: | 2234-943X |
| DOI: | 10.3389/fonc.2024.1447123 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.3389/fonc.2024.1447123 Verlag, kostenfrei, Volltext: https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2024.1447123/full 
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| Verfasserangaben: | Marlen Haderlein, Jens von der Grün, Panagiotis Balermpas, Claus Rödel, Matthias G. Hautmann, Felix Steger, Christopher Bohr, Thomas Hehr, Carmen Stromberger, Volker Budach, Markus Schymalla, Rita Engenhart-Cabillic, Lukas Kocik, Hans Geinitz, Ursula Nestle, Gunter Klautke, Claudia Scherl, Christine Gall, Benjamin Frey, Philipp Schubert, Sabine Semrau, Oliver Ott, Marco Kesting, Heinrich Iro, Sarina K. Mueller and Rainer Fietkau |
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| 245 | 1 | 0 | |a De-intensification of postoperative radiotherapy in head and neck cancer irrespective of human papillomavirus status - results of a prospective multicenter phase II trial (DIREKHT Trial) |c Marlen Haderlein, Jens von der Grün, Panagiotis Balermpas, Claus Rödel, Matthias G. Hautmann, Felix Steger, Christopher Bohr, Thomas Hehr, Carmen Stromberger, Volker Budach, Markus Schymalla, Rita Engenhart-Cabillic, Lukas Kocik, Hans Geinitz, Ursula Nestle, Gunter Klautke, Claudia Scherl, Christine Gall, Benjamin Frey, Philipp Schubert, Sabine Semrau, Oliver Ott, Marco Kesting, Heinrich Iro, Sarina K. Mueller and Rainer Fietkau |
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| 520 | |a Background: Current standard treatment concepts in head and neck squamous cell carcinoma (HNSCC) are based on former studies using 2D and 3D treatment plans. However, modern radiation techniques allow for a more precise and individual dose application. Therefore, in a clearly defined patient population, de-intensified risk-adapted radiation is investigated. Methods: Patients with newly diagnosed HNSCC after surgery (with resection margins ≥1 mm and cM0) with the following tumor stages (TNM 7th Edition) were eligible for the study: oral cavity, oropharynx, or larynx: pT1-3, pN0-pN2b; hypopharynx: pT1-2, pN1. The patients should have either a low risk of local recurrence [≤pT2, resection margin ≥5 mm, no peritumoral lymphangiosis (L0), and no perineural invasion] or contralateral lymph node metastasis (≤3 ipsilateral lymph node metastases, in case of well-lateralized oropharyngeal or oral cavity cancer contralateral cN0, otherwise pN0). Patients were assigned to three different treatment regimes with reduction of the treated volume, radiation dose, or both, according to tumor stage and results of surgery performed. The primary objective was to show an LRR of <10% after 2 years. Findings: A total of 150 patients were enrolled. Tumor localizations were as follows: n = 53 (35.3%), oral cavity; n = 94 (62.7%), oropharynx (82% HPV-positive); n = 2 (1.3%), hypopharynx; and n = 1 (0.7%), larynx. A total of 61 patients (41.0%) were stage IVA, 81 (54.0%) were stage III, and 8 (5.3%) were stage II. Median follow-up was 36 months. Cumulative incidence of 2y-LRR was 5.6% (95% CI: 1.7%-9.2%) in the whole study population and 14.1% (95% CI: 3.8%-23.2%) in patients with oral cavity cancer. Cumulative incidence of 2y-LRR in non-irradiated or dose-reduced regions was 3.5% (95% CI: 0.4%-6.5%). After 2 years, disease-free survival was 92% (95% CI: 87%-96%) and overall survival was 94% (95% CI: 90%-98%) for the complete study cohort. Acute III° toxicity was as follows: dysphagia, 30%; xerostomia, 7%; mucositis, 19%; and dermatitis, 4%. Dysphagia and xerostomia decrease over time. After 27 months, late dysphagia III° and xerostomia II° were 1% and 9%, respectively. Interpretation: The study met its primary objective. De-intensification of postoperative radiotherapy irrespective of HPV status in a predefined patient population is associated with a favorable toxicity profile without compromising LRR. In an unplanned subgroup analysis, a significantly increased risk of LRR was observed in patients with oral cavity cancer. In these patients, de-intensified radiotherapy should be applied with caution. | ||
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