Abbreviation	Definition
ICI	Immune Checkpoint Inhibitor
PD	Programmed Death (e.g., PD-1, PD-L1)
CTLA	Cytotoxic T-Lymphocyte Antigen
NK	Natural Killer Cell
NSCLC	Non-Small-Cell Lung Cancer
HCC	Hepatocellular Carcinoma
CRC	Colorectal Cancer
RCC	Renal Cell Carcinoma
GI	Gastrointestinal
FMT	Fecal Microbiota Transplantation
SCFA	Short-Chain Fatty Acid
LPS	Lipopolysaccharide
GUS	Gut Microbial /$\beta$-glucuronidases
PFS	Progression-Free Survival
OS	Overall Survival
RCT	Randomized Controlled Trial
TME	Tumor Microenvironment
NAFLD	Non-Alcoholic Fatty Liver Disease
IL	Interleukin