system
Given the following post, respond as if you're commenting on Reddit:
human
How old is Cancer?

Whats the earliest evidence we have of Cancer existing? What do we know about how and when it evolved? Or has it always existed, as long as life on earth has existed?
gpt
Cancer is, in simple terms, cell division gone *really* wrong. New cells are not perfect replicas and their differences don't matter in the short run, but very rarely some change in hamrful ways: they end up dealing damage to the organism by keeping surrounding tissue from functioning properly as the mutated cells keep growing, using ressources, space and so on. So, cancer is just a little younger than multi-cell-based life.