Overview Study to Evaluate the Effect of GBT440 Administered to Subjects With IPF on Supplemental Oxygen at Rest Status: Terminated Trial end date: 2017-10-23 Target enrollment: Participant gender: Summary This is an open label study in which eligible IPF subjects who are using supplemental oxygen at rest will receive GBT440 orally daily. Phase: Phase 2 Details Lead Sponsor: Global Blood Therapeutics