system
Given the following post, respond as if you're commenting on Reddit:
human
How come there is no cancer of the muscle or the heart?

I have never heard of biceps cancer or trapezius cancer. Doesn't cancer affect muscle cells?
gpt
In general, cancers are most likely to occur in tissues with cell populations that divide a lot over the lifespan of the organism. These include epithelial layers (skin, GI tract, breast, prostate) , blood cells, etc. Muscle and nerve divide much less frequently so cancers arising from these cell populations are very rare. You may be thinking, "then what about brain cancer?" Most brain cancers arise not from neurons themselves but from the supportive glial cells which divide more often.