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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People who don't have a medical background are not necessarily all stupid. Just as all medical doctors aren't arrogant pricks.
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Now defend the definition of a fetus as a parasite, if so then a parasite never stop being a parasite that makes every animal and human born from a fetus a grown up parasite.
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