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Wow, this stops and reverses cancer in progress (in mice).

It's not just a preventative measure to eliminate the potential of possible cancers from emerging. The cancers the mice already have goes away.

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If I'm understanding the article correctly, it actually can't be used as a strictly preventative measure. It relies on the fact that the subject already has a tumor and that the subject's immune system has made progress in targetting the tumor.

It also seems like that particular cancer mutation is permanently targeted, but yes it’s not like this shot will be given to four year olds as a general prophylactic

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