Compared with control patients (ICI-naïve AML/MDS patients with bacterial/fungal pneumonia), patients with ICI-related pulmonary complications had enriched lymphocytes, especially Th17/Th1 cells and IFNγ+ CD8+ T cells, in BAL fluid, as well as clonally expanded BAL T cells. The gene discussed is IFNG; the disease is acute myeloid leukemia.