ESTRO 2020 Abstract book

S712 ESTRO 2020

according to sex, ECOG and the most prevalent primary tumors are shown in figure 1.

Conclusion Our results are aligned to previous studies. Male sex, ECOG, Karnofsky and presence of visceral disease were identified as an independent predictor to 30-DM for patients treated with palliative radiotherapy. This data suggests that palliative radiotherapy should be chosen reflecting about the patient’s life expectancy. Our study provides more evidence of the 30DM rate in palliative radiotherapy that may help for selecting patients that could benefit. PO-1261 Radiation pneumonitis after palliative radiotherapy in patients with interstitial lung disease M. Okumura 1 , H. Hojo 1 , N. Nakamura 1 , S. Zenda 1 , A. Motegi 1 , M. Nakamura 1 , Y. Hirano 1 , S. Kageyama 1 , V.P. Raturi 1 , T. Akimoto 1 1 National Cancer Center Hospital East, Radiation Oncology, Kashiwa, Japan Purpose or Objective Many studies have reported a risk of radiation pneumonitis (RP) after definitive thoracic radiotherapy (RT) in patients with interstitial lung disease (ILD). However, the RP risk after palliative radiotherapy in patients with ILD has not been clarified. The aim of this study was to investigate the incidence, severity, and predictive factors of RP after palliative RT in patients with ILD. Material and Methods The medical records of 59 consecutive patients with ILD who received palliative RT involving the lung field at the National Cancer Center Hospital East in Japan between April 2009 and July 2019 were retrospectively reviewed.