Chemotherapy-free ‘cancer vaccine’ moves from mice to human trials at Stanford

The lead researcher speculated that the injectable drug combination might be approved no sooner than 1-2 years.

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How come lead researcher speculates that injectable drug combination might be approved no sooner than 1-2 years?? Does not clinical trial take 5-6 years?

I think it said the drugs are already approved, but using them together is new.

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