Martine Rothblatt
Chairman
Sure. Thanks. I'm going to answer the first question, which is kind of, I guess more of like a strategic overall question and then I'm going to pass it to Dr. Peterson to answer the scientific question relating to ralinepag. So as to the durability of our revenue growth, I think it looks really strong, and that was the reason I wanted to kind of highlight in the introductory remarks that we're not talking about growing within kind of a single small finite crowded pond, which is a bit how I would describe Group 1 pulmonary hypertension, about ten approved drugs, roughly speaking, 50,000 U.S. patients. We are going to grow in that Group 1 pulmonary hypertension. But the durability of our growth, you know, throughout the 2020 doesn't depend just on Group 1 pulmonary hypertension. We've been on top of that, have this Group 3 community, which is one of their feet are in pulmonary fibrosis, which is the cause of their disease, and the other of their feet is in pulmonary hypertension which we know very well. And now, we are - we've done the necessary pivotal trial, executed to a level of scientific rigor and confidence that it enjoyed publication in the New England Journal of Medicine, and hopefully to be approved in April. Now with that launch, we would go into a patient population of approximately 30,000 patients who are almost are already being treated for their pulmonary fibrosis, but virtually none of them are being treated for their pulmonary hypertension because there was no drug approved to treat that. And that's why I mentioned at the beginning of the call, this is to me like you know kind of a very beautiful scenario. It's like when we started the Company a decade or two ago, there were maybe 20,000 pulmonary hypertension patients, and we were competing with Glaxo on the side. We were competing with Actelion on the oral side. We were competing with another drug called Iloprost on the inhaled side. And those actually fragmented and then we had ten different competitors as we do to date, but still growing organically within Group 1. But in Group 3 there is none of that. There's 30,000 patients in need of a therapy and hopefully knock on wood, the - we will get approved in April and then we have an awesome therapy for them in Tyvaso. And then Mike just - you know, a year later, absolutely revolutionary therapy with the Tyvaso DPI product. So I think that's going to drive our growth for well beyond 2021, in fact for several years. And then, you know, one more thing, which I mentioned in the introductory remarks, is this pure pulmonary fibrosis population of 100,000 patients in the U.S., all being managed with a drug, which unfortunately reduces the rate of decline in their forced vital capacity, but does not improve it, does not modify the disease and we've got this very promising data from the INCREASE study that builds upon earlier bench-top data that shows actually there is disease modifying capability in Tyvaso for patients with pulmonary fibrosis. We need to now validate that hypothesis with the prospective study, which is what our TETON study is currently enrolling. So you add up the Group 1, the Group 3, the pulmonary fibrosis, not to mention the PERFECT study, and I think this growing our patients by double-digit rates is something that can be reasonably anticipated for the balance of the 2020. So with that answer to your business question or strategic question, let me shift over to Dr. Peterson to address the scientific question.