United Therapeutics Announces FDA Clearance to Proceed with SUMMIT Clinical Trial for Treprostinil SMI in PH-COPD

SILVER SPRING, Md. & RESEARCH TRIANGLE PARK, N.C.--(BUSINESS WIRE)--United Therapeutics Corporation (Nasdaq: UTHR), a public benefit corporation, today announced that the U.S. Food and Drug Administration (FDA) has granted clearance under the company’s investigational new drug application to proceed with the SUMMIT clinical trial of treprostinil SMI in PH-COPD. The phase 2, 16-week, double blind SUMMIT study will evaluate the safety and tolerability of treprostinil SMI in approximately 40 patie