When to not rejuvenate

1. Boosting regeneration (colloquially called “rejuvenation”) is good for the organism. Unless this organism is riddled with precancerous cells, which all organisms do. Then boosting regeneration gives these cells free reign to form tumors.
2. Getting rid of ~all precancerous cells is a necessary step before turning up regeneration
3. But doing it once isn’t enough: new oncogenic mutations will appear and kill the organism if the regeneration is turned up.
4. Therefore, to survive, you need to either reliably kill oncogenic cells as they appear, or to stop oncogenic mutations from occurring.