system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is heart cancer so rare compared to other types of cancer?
gpt
Cancer is a failure in growth regulation that results from mutations.  The way tumors develop is these damaged cells divide and make daughter cells that are likewise damaged.

Cells that divide a lot are more prone to cancer (like skin cells)

Heart muscles don’t divide much so they don’t copy their dna mistakes and make damaged daughter cells.