showed that patients experiencing ICI-pneumonitis displayed increased numbers and frequencies of CD45RA-CCR7-CD8+ effector memory T cells and Th1/Th17 (CXCR3-T-bet+CCR6+RORγt+) cells in bronchoalveolar lavage (BAL) fluid, compared to the control group with bacterial pneumonia without ICI treatment. Here, CD8A is linked to pneumonitis.