Japanese Journal of Clinical Oncology, Vol 29, Issue 4 192-197, Copyright © 1999 by Foundation for Promotion of Cancer Research
T Makimoto, S Tsuchiya, K Hayakawa, R Saitoh and M Mori
BACKGROUND: Risk factors for severe radiation pneumonitis, which often
spreads beyond treatment portals and may even be bilateral, have not been
fully investigated. The purpose of this study was to identify important
factors associated with severe radiation pneumonitis. METHODS: 111 cases of
primary lung cancer, treated with radiotherapy or chemoradiotherapy, were
retrospectively analyzed. RESULTS: Severe radiation pneumonitis occurred in
17 cases (15.3%). The ratio of interstitial change in lungs before
radiotherapy and radiotherapy to the contralateral mediastinum with > 40
Gy in the radiation pneumonitis group (RP group) was significantly higher
than in patients without radiation pneumonitis (control group) (47.1% vs
5.3%; P < 0.001 and 58.8% vs 27.7%; P = 0.037, respectively). Using
logistic regression analysis, interstitial changes before radiotherapy and
radiotherapy to the contralateral mediastinum of > 40 Gy were
significant risk factors associated with severe radiation pneumonitis.
CONCLUSIONS: These data suggest that pre-existing interstitial changes
detected by chest radiography or computed tomography and radiotherapy to
the contralateral mediastinum (> 40 Gy) may predict the development of
severe radiation pneumonitis.
ORIGINAL ARTICLE
Risk factors for severe radiation pneumonitis in lung cancer
Department of Internal Medicine, National Nishi-Gunma Hospital, Japan.
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