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Dyspnea in Patients Receiving Radical Radiotherapy for Non-Small Cell Lung Cancer: A Prospective Study.

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Radiation therapy for lung cancer can cause breathing difficulties (dyspnea) due to lung injury (RILI). Lung radiation dose parameters correlate with worsening dyspnea, supporting the use of patient-reported outcomes in toxicity studies.

Keywords:
dose-volume parametersdyspneanon-small cell lung cancerradiation-induced lung injuryradiotherapy

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Area of Science:

  • Radiation oncology
  • Pulmonary medicine
  • Medical physics

Background:

  • Dyspnea is a key symptom of radiation-induced lung injury (RILI) after lung cancer radiotherapy.
  • Radiotherapy techniques and treatments are advancing, necessitating better understanding of RILI.

Purpose of the Study:

  • To investigate the relationship between lung dose-volume parameters and subjective dyspnea changes.
  • To explore the correlation between lung dose-volume parameters, dyspnea, and spirometry.

Main Methods:

  • Eighty patients with non-small cell lung cancer undergoing radical radiotherapy were prospectively assessed.
  • Dyspnea was evaluated using EORTC QLQ-LC13 and visual analogue scale (VAS), alongside spirometry and global quality of life.
  • Lung dose-volume parameters were compared with patient-reported outcomes.

Main Results:

  • Positive correlations were found between lung dose-volume parameters and changes in dyspnea scores at 3 and 6 months post-radiotherapy.
  • Specific parameters (V30, V40, V50, mean lung dose) correlated with increased dyspnea.
  • Lung dose-volume parameters predicted a 10% increase in subjective dyspnea scores.

Conclusions:

  • Worsening dyspnea is a significant indicator of RILI.
  • A clear relationship exists between lung dose-volume parameters and subjective dyspnea worsening.
  • Subjective dyspnea tools are valuable for future RILI studies, especially below conventional tolerance limits.