The purpose of this non-interventional study is to collect data on the risk factors for acute radiation pneumonitis in patients with prior receipt of immune checkpoint inhibitors.

1. Incidence of acute radiation pneumonitis (aRPs) in in patients with prior receipt of immune checkpoint inhibitors.
2. Risk factors (especially analysis of the dosimetric risk factor) which may affect the product of aRPs events.
3. Establish a model to predict aRPs and guide clinical treatment.

Inclusion Criteria:

1. Pathologically or cytologically confirmed malignant tumor
2. Cancer patients with previously received ICIs underwent thoracic intensity-modulated radiotherapy

Exclusion Criteria:

1. Cancer patients did not receive immunotherapy before thoracic intensity-modulated radiotherapy
2. Non-thoracic radiotherapy patients

All patients treated with the product will be enrolled in the investigation