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A benign tumor has an outer layer of cancerous cells beyond which are regular cells (I Think). The Tumor must have some kind of boundary layer like a wall where somehow the cancerous cells can't affect any more normal cells outside the wall. A Benign Tumor I think can be inactive for many months; it might never grow anymore. Might it be that the cancer cells at this Benign Tumor Wall are inhibited from affecting any more cells? Could there be an Apoptosis shut-off inhibitor or a cell-death pathway shutting-off inhibitor in this case?

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Immune system fights cancer ... –  biogirl May 6 at 7:25
    
Are inhibitors part of the immune system? –  user128932 May 8 at 7:14
    
There are some cells...I think NK cells..search NK cells on wikipedia –  biogirl May 8 at 13:17

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