Tumor budding — clusters of one to four cancer cells at the invasive edge of colorectal tumors — is emerging as a powerful marker of how cancers spread. Researchers have reviewed how these budding cells undergo a partial shift away from their original epithelial identity, loosening cell-to-cell connections and remodeling surrounding tissue without fully transforming into migratory cells. The immediate neighborhood of these buds is also immunologically suppressed, with fewer functional immune cells able to attack the tumor. Digital pathology tools and AI-assisted analysis are improving how pathologists detect and score budding. Together, these insights suggest tumor budding could guide more precise treatment decisions for colorectal cancer patients.
