Does it matter how old the tech is, or how GOOD the tech is? It hasn't been utilized before in this manner and PMCB is advancing it beyond it's original intentions and capabilities. The auto-mobile was invented in 1885, and the airplane in 1902 (or much much earlier), yet those old techs are being used and reinvented and utilized beyond the original inventor's imaginations.
The answer: There was not a way of deliver the cells because the immune system will destroy them and the whole thing works and is based on the local deliver bypassing liver. The applications are endless unlike many years ago that the whole industry was in infants steps more sure to come...