The lungs and around the intestines, all of our organs. it is not just a dense connective tissue. they believe it is an organ that is interconnected in a network that communicates with each other. >> arthel: how might this teach doctors and scientists how cancer works? >> this is, basically this is, it may allow cancer to spread. no when cancer spreads through the body. so could it be that the cancer cells may start in the breast get into the brain or the lungs? there's out the window and thought we do not know. there is a lot we still need to learn a lot about. if we can figure out exactly ho...