A gene therapy treatment, which we can call parzyl, costs almost a million dollars.

There is something sleazy going on with the generic name, "voretigene neparvovec-rzyl". Even to write it is a pain, and as for pronouncing it, should we treat it as English or as Polish? I don't know of any language other than Polish in which "rz" has a meaning.

In effect, the drug theoretically has a generic name, but not in practice. So I suggest calling it "parzyl".