I have two questions, maybe somebody with expertise could answer them. 1. What is the breakthrough here? Delivery of medicine through feeder vessel? The idea

I have two questions, maybe somebody with expertise could answer them. 1. What is the breakthrough here? Delivery of medicine through feeder vessel? The idea of how to implement it (needle, robots, tube, etc)? Or just the actual design of the rig to do it? 2. In what situations can you target a tumor up through a blood vessel and not have the option of cutting it out? Is this a brain situation?