The lung.
D001943:Breast Neoplasms / Q000532:radiotherapy; D001984:Bronchial Neoplasms / Q000532:radiotherapy; D005260:Female; D006801:Humans; D008168:Lung / Q000528:radiation effects*; D011658:Pulmonary Fibrosis / Q000209:etiology; D011830:Radiation Effects; D011878:Radiotherapy / Q000009:adverse effects*