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Moderna’s mRNA cancer vaccine works even better than thought
(www.freethink.com)
This is a most excellent place for technology news and articles.
Multifactor analysis still requires an underlying commonality. People taking multiple drugs are all still taking the drug being trialed. You're removing the confounding factors. If every treatment is a unique cancer protein there is no common factor. The treatment is the confounding factor.
To put it another way. A safety trial has to prove that any protein administered is safe.
Edit: just realised you're probably talking about efficacy trials, whereas I'm more concerned with safety.