I.e. radiation therapy to the chest, mediastinum, supraclavicula fossae or breast. See also under other radiation therapy headings including SBRT. Radiation therapy techniques have changed in the past decades. More adverse effects were observed in the past following 67Co radiation therapy. Reviews at PMID 10682772, 12932614, 23473474, 23583253, 23876528, 23972736. Chemotherapy sensitizes the lung to the effects of radiation (PMID 12118569) and vice versa. Incidence of radiation pneumonitis following reirradiation may be greater than for 'first-hand' irradiation (PMID: 25841506)