Precision Delivery of Active Compounds from Edible and Medicinal Plants via Gut Microbiota Targeting: A New Paradigm for Cancer Immunotherapy

The immune system plays a pivotal role in the progression of tumors. Recent advancements in immunotherapies, notably CAR-T cell therapy and checkpoint inhibitors, have markedly improved clinical outcomes. However, a significant proportion of patients continue to experience treatment resistance, posing a persistent and formidable challenge. The gut microbiota has been established as a critical determinant of responses to immunotherapy. Enriched with bioactive components such as polysaccharides, (poly)phenols, and flavonoids, edible and medicinal plants (EMPs) exhibit significant potential to enhance host immunity by reshaping the gut microbiota, increasing the production of microbiota-derived metabolites (e.g., short-chain fatty acids), strengthening the intestinal barrier, and reducing intestinal inflammation. The bioactive components derived from EMPs not only demonstrate substantial pharmacological activities but also serve dual roles: functioning either as inherent drug carriers or as effective modifiers for existing carrier systems, which facilitates targeted drug delivery to specific sites such as the liver and intestinal, enhancing therapeutic efficacy. In summary, this review highlights that bioactive components from EMPs hold significant promise for enhancing cancer immunotherapy by modulating complex interactions with the gut microbiota.