I have a friend who is mentoring a PhD candidate who is researching COPD, looking at stem cell therapy. He sent me links to some research. Unfortunately, right now there isn't anything that produces lasting results. One clinic that I interacted with in Tampa indicated that they extract your stem cells from blood and then inject the stem cells. They claim to have good results however, I have a history of cancer as well and they indicated that the stem cells could regenerate the cancer as well. I decided I'd not try that.