Oh don't you worry some pharmabro will change (edit: will pay someone actually smart to change) a single atom within a single molecule of the antibody, or however the fuck they do it, and they'll re-patent all of the derivatives, and nobody will make the off-patent version of pembrolizumab due to drug companies bribing benefit managers to not cover the off-patent versions, the fact that you can't charge $150k/yr for it, and gentlemen's agreements between drug manufacturers to not harsh anyone's vibe.

If we're lucky congress won't be bribed, I mean lobbied for the sake of safety, into criminalizing its importation.