CD8A and neoplasm: Specifically, MSS-type CRC exhibits lipid raft structural remodeling driven by dysregulated lipid metabolism, which fosters multiple immune escape mechanisms through exosome-mediated immunosuppressive signaling, promotion of tumor-associated macrophage (TAM) M2 polarization, enhanced infiltration of regulatory T cells (Tregs), and functional exhaustion of effector cells, such as CD8+ T cells and NK cells.