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A new extract of the plant Calendula officinalis produces a dual in vitro effect: cytotoxic anti-tumor activity and lymphocyte activation
MHC class I molecules act as tumor suppressor genes regulating the cell cycle gene expression, invasion and intrinsic tumorigenicity of melanoma cells.
Total loss of HLA class I expression on a melanoma cell line after growth in nude mice in absence of autologous antitumor immune response.