How is the growth of benign tumors suppressed?
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?