Approval for sotatercept, “a selective ligand trap for members of the TGF-beta [transforming growth factor-beta] superfamily which rebalances BMPR-II [bone morphogenetic protein receptor type II] signaling,” was based on two types of research. It was based on results of preclinical research indicating “reversed pulmonary vessel muscularization and improved indicators of right heart failure,” as well as results of the phase 2, placebo-controlled PULSAR study, in which sotatercept showed positive results, meeting primary and secondary endpoints.
Adverse events during PULSAR “were consistent with previously published data on sotatercept” in other diseases. The drug is also under investigation in the phase 2 SPECTRA trial, which includes patients with PAH.
“We believe that sotatercept has the potential to shift the current treatment paradigm and provide significant benefit to patients with PAH on top of currently available therapies. Thus, we’re thrilled that the FDA has granted this Breakthrough Therapy designation – a first for an Acceleron-discovered medicine and for a therapeutic candidate in PAH – as it supports and aligns with our mission to deliver novel therapeutic options to patients in need as quickly as possible,” Habib Dable, president and CEO of Acceleron Pharma, said in the press release.