system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Do plants get cancer? Why or why not?
gpt
Plants get tumors, but it's debatable whether they qualify as cancer.  Examples of a tumor on a plant include a burl or crown gall. The tumors are uncontrolled and abnormal growth of cells, which is one definition of cancer. But tumors don't spread throughout the body (called metastasizing) in plants like they do in humans because plant cells have cell walls that make the structure rigid and lock cells in place. Some definitions of cancer include that it spreads, so in that sense the term wouldn't apply.