Abstract:

The combination of thoracic radiotherapy and immunotherapy is increasingly widely used in clinical practice，which not only brings survival benefits but also increases the incidence of pneumonitis. The occurrence of pneumonitis affects the subsequent immunotherapy and can be life-threatening in severe cases. The occurrence and severity of pneumonitis after combination therapy depends on a variety of factors，including patient's age，physical strength，pulmonary function，race，combination therapy mode，radiotherapy dose parameters，type of immune checkpoint inhibitor，history of checkpoint inhibitor-related pneumonitis or radiation pneumonitis，serum indexes and so on. At present，further research is needed to find out the influencing factors of the occurrence and severity of pneumonitis attributed to combined therapy，so as to better avoid，predict，identify and treat related pneumonitis in clinical practice.

Key words: Thoracic radiotherapy, Immunotherapy, Pneumonitis