In theory - this is a big step forward on targeted immunology. But I’m reading that what they did here was aim for a wipe out of her immune system, to be replaced by a new bone marrow transplant. Usually that can be accomplished by radiation but that didn’t work in this case.

It’s not applicable for other types of cancer yet because let’s say you have liver cancer - you wouldn’t want/need a tool that wipes out all liver cells.

That said, we’re at the cudgel stage with the technique. The ideas behind it and the tools developed will continue to advance, until we have a hammer, then a chisel, then a pen, then a micro laser.