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The 1-year cumulative probabilities for development of Grade 1 radiation-induced pneumonitis (RIP) were 83.8% and 48.4% for the COPD − and COPD + groups, respectively (a). The 1-year cumulative probabilities for continuation of prolonged minimal RIP (pmRIP) were 15.1% and 30.7% for the COPD − and COPD + groups, respectively (b).
