This hinges on being able to specifically recognize the cancer, which is really the whole problem to begin with. If you can figure out a way to put all of a particular cancer’s cells in the crosshairs and none of your other cells, then you might as well engineer immune cells to kill that cancer rather than engineering a pathogen to infect the cancer *and* relying on immune cells to kill all these infected cells. It’s all very complicated to actually make work, and the fewer points of failure the better.
Latest Answers