主题词：MicroRNA in disease regulation; Liver Disease Diagnosis and Treatment; Gut microbiota and health; Cancer Immunotherapy and Biomarkers; Extracellular vesicles in disease; COVID-19 Clinical Research Studies; Cancer-related molecular mechanisms research; Adipokines, Inflammation, and Metabolic Diseases; Neuroinflammation and Neurodegeneration Mechanisms; Mesenchymal stem cell research; Immune cells in cancer; Cancer, Hypoxia, and Metabolism; Epigenetics and DNA Methylation; Alzheimer's disease research and treatments; Ferroptosis and cancer prognosis; Adipose Tissue and Metabolism; RNA modifications and cancer; Immunotherapy and Immune Responses; Tryptophan and brain disorders; Diet and metabolism studies; Cancer Cells and Metastasis; CAR-T cell therapy research; Immune Cell Function and Interaction; Diabetes Treatment and Management; SARS-CoV-2 and COVID-19 Research