system
Given the following post, respond as if you're commenting on Reddit:
human
How does cancer spread?

I've recently learned that cancer may spread into different tissues (for example prostate cancer into the bone). Since cancer is usually not caused by any pathogenic microorganism, which could infect other parts of the body, how does it spread into different organs?
gpt
In order to spread (metastasize), cancer cells must detach from the primary tumor, invade into the circulatory (blood vessels) and lymphatic systems, evade immune attack, extravasate at distant capillary beds, and invade and proliferate in distant organs (such as bones in the case of prostate and some other cancers).
How cells manage to do each of these steps is very complex and the subject of intensive research.