To investigate the impact of presence/absence or grade of radiation pneumonitis before starting IMFINZI, on the onset of interstitial lung disease (including radiation pneumonitis) after starting IMFINZI, in the real world in patients with locally advanced unresectable non-small cell lung cancer who are treated with the product as maintenance therapy after definitive chemoradiation therapy.

Inclusion Criteria:

-Patients with locally advanced unresectable non-small cell lung cancer who are treated with IMFINZI for the first time as maintenance therapy after definitive chemoradiation therapy

Exclusion Criteria:

-No past history of hypersensitivity to the components of IMFINZI

Patients with locally advanced unresectable non-small cell lung cancer after definitive chemoradiation therapy