Tumour exosomes have been found to express a number of immunosuppressive molecules including surface-exposed phosphatidyl serine [167], the death receptor ligands FasL and TRAIL, immune checkpoint inhibitor ligands (e.g., PD-L1), and inhibitory cytokines (e.g., IL-10, TGF-β1) [166]. This evidence concerns the gene CD274 and neoplasm.