Is it possible if someone had cancer that had metastasized and floated in the blood stream, if you take blood from that person and inject it into another will that person develop cancer?
I know one of the main things is that the body doesn't recognize the cancer within the host as something bad so it doesn't fight against it, so if foreign cells were in someone else I take the assumption that the body would recognize this as a threat.
But what if this cancer was so sophisticated it could defend itself outside of the body within a different host?
theoretically could there exist a cancer virus?