Abstract
Active cell death is a genetically encoded self-destruction of a cell. There occur morphologically different types of active cell death, e.g. apoptosis in the liver or autophagic cell death in human mammary carcinoma cells after tamoxifen treatment. (Pre)neoplastic lesions in rat liver exhibit enhanced rates of apoptosis, which tend to increase with increasing malignancy. Tumor promoters and non-genotoxic carcinogens inhibit active cell death, thereby increasing the accumulation of (pre)neoplastic cells and accelerating the development of cancer. On the other hand promoter withdrawal, fasting or application of negative growth signals such as transforming growth factor β1 (TGF β1) enhance apoptosis and can lead to selective regression of preneoplastic lesions or tumors.
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