ESTRO 2025 - Abstract Book

S971

Clinical – Head & neck

ESTRO 2025

Conclusion: We provided detailed information about lymphatic spread patterns of laryngeal SCC, depending on subsite, T-stage, lateralization, and upstream involvement. Thereby, subgroups of patients may be identified in whom the elective nodal irradiation may be reduced compared to current guidelines. For example, elective irradiation may be omitted in patients with T2-glottic tumors. For patients with supraglottic or advanced stage (T3/T4)-glottic SCC there is a potential for omitting downstream or contralateral levels from the elective CTV.

Keywords: larynx, CTV, lymphatic metastasis

References: 1. Biau J, Lapeyre M, Troussier I, Budach W, Giralt J, Grau C, et al. Selection of lymph node target volumes for definitive head and neck radiation therapy: a 2019 Update. Radiother Oncol. 2019;134:1-9. 2. Ludwig R, Hoffmann JM, Pouymayou B, Däppen MB, Morand G, Guckenberger M, et al. Detailed patient-individual reporting of lymph node involvement in oropharyngeal squamous cell carcinoma with an online interface. Radiother Oncol. 2022;169:1-7 3. Ludwig R, Pouymayou B, Balermpas P, Unkelbach J. A hidden Markov model for lymphatic tumor progression in the head and neck. Sci Rep. 2021;11(1):12261.

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Digital Poster Conventional Fractionation vs. Stereotactic Body Radiotherapy: A Comparative Approach in Postoperative Management of Head and Neck Sarcomas Alper Kahvecioglu 1 , Mervenur Bay 1 , Sezin Yuce Sari 1 , Gozde Yazici 1 , Oguz Kuscu 2 , Mustafa Cengiz 1 1 Radiation Oncology, Hacettepe University Faculty of Medicine, Ankara, Turkey. 2 Otorhinolaryngology, Hacettepe University Faculty of Medicine, Ankara, Turkey