| ICI | Immune Checkpoint Inhibitor |
| pCLE | Probe-based Confocal Laser Endomicroscopy |
| IBD | Inflammatory Bowel Disease |
| GI | gastrointestinal |
| irAE | immune-related adverse event |
| SCFA | short-chain fatty acid |
| PD-1 | programmed cell death protein 1 |
| PD-L1 | programmed death-ligand 1 |
| CTLA-4 | cytotoxic T-lymphocyte-associated protein 4 |
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