system
Given the following post, respond as if you're commenting on Reddit:
human
Is there any part in the body that cannot get cancer?
gpt
Cancer is unchecked cell growth that interferes with healthy function by changing or blocking blood flow,  co-opting resources, and causing deterioration. 

Both body parts and cancer cells that are alive need circulation. Ostensibly, "dead parts" like hair and nails can't get cancer because they are not growing. But they can be affected by cancer, certainly.