“…Several tumours, such as melanoma, ovarian carcinoma and B-cell lymphoma have been found to produce the immunosuppressive cytokine IL-10, which can reduce DC development and activity. 60,72 Moreover, tumour cells are able to produce transforming growth factor-b 73 and prostaglandin E2, 74 which play a significant role in immunosuppression. Fourth, partial or complete loss of CD95 (Fas) expression on tumour cells may enable them to escape CD95-mediated killing.…”