HLA-C and neoplasm: Instead, the antigen–MHC complexes from the other adjacent DCs or tumor cells (donor cells) get transferred to the APCs, such as DCs (receiver cells), though various mechanisms, including trogocytosis, exosome uptake, and tunneling nanotubes [49,56,57,58,59], and activate the related effector T cells without further antigen processing stages [60,61,62,63,64,65,66].