Programmed cell death. It is designed to prevent old damaged cells from mutating into neoplastic (cancer) cells.

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The properties of benign tumours

Do benign tumours have no functioning apoptosis mechanisms ? If so what stops benign tumours from excessive growth? Also can a benign tumour have a functioning apoptosis mechanism?
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Can a cell completely lose the ability to undergo apoptosis?

What I mean is - can a super-cancer cell completely lose the ability to kill itself, losing all apoptosis-related mechanisms and becoming eternally resistant to any drug that tries to induce apoptosis ...
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Cells with no apoptosis mechanism and their 'byproducts'

If a culture or sample of cells is such they all have no apoptosis mechanisms yet they have not been at present determined to be cancerous ; given such a cell culture is there a way to determine by ...
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Regarding benign tumors and what 'stops' them

Benign tumors can grow to dangerous size yet are they capable of metastisizing ; if not what stops this? Also with a benign tumor if you call its cells 'near' its edges its tumor 'cell wall' I was ...
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Stem cells and if they can correct a lack of apoptosis

If a cell ,call it C1 has no functioning apoptosis mechanism could a stem cell somehow be 'induced' to be like C1 , at least have the same genome as C1. Then use this stem cell 'duplicate' to 'restart'...