Cancers (Mar 2023)

Adjuvant Radiotherapy in Patients with Squamous Cell Carcinoma of the Oral Cavity or Oropharynx and Solitary Ipsilateral Lymph Node Metastasis (pN1)—A Prospective Multicentric Cohort Study

  • Peer W. Kämmerer,
  • Silke Tribius,
  • Lena Cohrs,
  • Gabriel Engler,
  • Tobias Ettl,
  • Kolja Freier,
  • Bernhard Frerich,
  • Shahram Ghanaati,
  • Martin Gosau,
  • Dominik Haim,
  • Stefan Hartmann,
  • Max Heiland,
  • Manuel Herbst,
  • Sebastian Hoefert,
  • Jürgen Hoffmann,
  • Frank Hölzle,
  • Hans-Peter Howaldt,
  • Kilian Kreutzer,
  • Henry Leonhardt,
  • Rainer Lutz,
  • Maximilian Moergel,
  • Ali Modabber,
  • Andreas Neff,
  • Sebastian Pietzka,
  • Andrea Rau,
  • Torsten E. Reichert,
  • Ralf Smeets,
  • Christoph Sproll,
  • Daniel Steller,
  • Jörg Wiltfang,
  • Klaus-Dietrich Wolff,
  • Kai Kronfeld,
  • Bilal Al-Nawas

DOI
https://doi.org/10.3390/cancers15061833
Journal volume & issue
Vol. 15, no. 6
p. 1833

Abstract

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(1) Background: Evaluation of impact of adjuvant radiation therapy (RT) in patients with oral squamous cell carcinoma of the oral cavity/oropharynx (OSCC) of up to 4 cm (pT1/pT2) and solitary ipsilateral lymph node metastasis (pN1). A non-irradiated group with clinical follow-up was chosen for control, and survival and quality of life (QL) were compared; (2) Methods: This prospective multicentric comprehensive cohort study included patients with resected OSCC (pT1/pT2, pN1, and cM0) who were allocated into adjuvant radiation therapy (RT) or observation. The primary endpoint was overall survival. Secondary endpoints were progression-free survival and QL after surgery; (3) Results: Out of 27 centers, 209 patients were enrolled with a median follow-up of 3.4 years. An amount of 137 patients were in the observation arm, and 72 received adjuvant irradiation. Overall survival did not differ between groups (hazard ratio (HR) 0.98 [0.55–1.73], p = 0.94). There were fewer neck metastases (HR 0.34 [0.15–0.77]; p = 0.01), as well as fewer local recurrences (HR 0.41 [0.19–0.89]; p = 0.02) under adjuvant RT. For QL, irradiated patients showed higher values for the symptom scale pain after 0.5, two, and three years (all p p p < 0.05); (4) Conclusions: Adjuvant RT in patients with early SCC of the oral cavity and oropharynx does not seem to influence overall survival, but it positively affects progression-free survival. However, irradiated patients report a significantly decreased QL up to three years after therapy compared to the observation group.

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