Yes, however the trial succeeded. But by "how much", is not yet released. This trial was not against placebo, but the already existing, and effective Keytruda treatment.

I believe both were done with Keytruda. Control was Keytruda without the mRNA treatment.

So this should answer the question of "how much better is this with the best we currently have".

We're in the dark ages of "effective" at the moment. But now we're starting to get there.

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Hope this helps:

https://archive.ph/SQQ97