Holy hell, you are ignorant. The way cancer invades and manipulates host immunity resembles the way the resembles the way the placenta invades the wall of the uterus. This resemblance had been known for over a century. It's nothing controversial among cancer biologists.
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Because the basic definition of a parasite is something that needs a host to survive (though technically different species, I think) . This isn't the point of what's being taught here anyway, it's just the point being driven by some disingenuous guy who wasn't even there.
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Thus your analogy is entirely backwards. A cancer is like a deranged fetus.
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And yes, the direction matters. The normal/natural/beneficial method gets highjacked by the abnormal/deleterious. This better explains the latter than yours does.
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