Mesoporous silica microparticles were embedded within this matrix, loaded with the STING agonist c‐di‐GMP, and functionalized to display the immunostimulatory signals, including anti‐CD3, anti‐CD28, and anti‐CD137 antibodies for T cells.[107] When implanted into a surgical cavity, the scaffold enabled substantial T cell expansion and migration to the tumor resection site and tumor‐draining lymph nodes, effectively eliminating residual tumor cells and reducing the risk of relapse. This evidence concerns the gene TNFRSF9 and neoplasm.