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Apoptosis, Cancer cell destruction. Killer T- Lymphocyte attacking a Cancer CellArtists impression in the style of Scanning Electron Micrography SEM. Image is a computer generated illustration showing a killer T- Lymphocyte, part of the bodies immune system, [ light blue colour ] causing a cancer cell [ blue green colour ] to go into Programmed Cell Death [PCD] by attacking it with specific chemicals . Apoptic bodies balloon from the cancer showing it is in a state of PCD. Apoptosis occurs naturally in the body as cells are replaced and regenerated, cancer cells typically have a malfunction of this mechanism which means they replicate without the necessary internal controls.