JAG1 and cancer: Studies have shown tumor interaction with macrophages in the tumor microenvironment (TME) plays a significant role in taxane resistance, yet the underlying molecular mechanisms are poorly understood.<h4>Methods</h4>In this study, we employed translatome profiling of paclitaxel-treated cancer cells, live-cell imaging analysis, gene knockdown/knockout, and in vitro cancer-macrophage coculture assays to unravel a novel chemoresistance mechanism mediated by tumor-macrophage interaction via the NOTCH2-JAG1 axis.