United Therapeutics Corporation is a biotechnology company. The Company is focused on the development and commercialization of products for the treatment of chronic and life-threatening conditions. The Company markets and sells four commercial therapies in the United States to treat pulmonary arterial hypertension (PAH): Remodulin (treprostinil) Injection; Tyvaso (treprostinil) Inhalation Solution (Tyvaso); Orenitram (treprostinil) Extended-Release Tablets (Orenitram); and Adcirca (tadalafil) Tablets (Adcirca). The Company markets and sells an oncology product in the United States, Unituxin (dinutuximab) Injection (Unituxin), which is approved for treatment of neuroblastoma. The Company is also engaged in early-stage research and development of a number of organ transplantation-related technologies.