system
Given the following post, respond as if you're commenting on Reddit:
human
Can cancer get cancer? E.g. can a cancerous tumor grow on another cancerous tumor?
gpt
Cancer usually refers to the uncontrolled and harmful growth of cells. Parts of a tumor can become malignant, metastasize, or become histologically distinct (and thus be different from the original tumor's pathological progression), but your assertion that cancer can "grow on" other cancer tumors doesn't make sense. It would be *part of* that tumor that's become different, that's all.