Core Viewpoint - Keros Therapeutics has decided to discontinue the development of cibotercept for pulmonary arterial hypertension (PAH) following safety concerns and will undergo corporate restructuring to align with strategic priorities [1][3][5]. TROPOS Trial Results - The TROPOS trial was a Phase 2 clinical trial evaluating cibotercept in combination with background therapy for PAH, which was halted due to observed adverse events, specifically pericardial effusions [2][7]. - The company voluntarily stopped dosing in all treatment arms of the trial after safety reviews indicated new adverse events [2]. Corporate Restructuring - Keros plans to reduce its workforce by approximately 45%, resulting in a total of 85 full-time employees, which is expected to yield annualized cost savings of about $17 million [5][6]. - The restructuring is aimed at aligning operations with ongoing development programs and maximizing stockholder value [6]. Future Development Strategy - The company will evaluate the potential development of cibotercept for other indications after completing a strategic alternative review process [4][6]. - Keros is also exploring various strategic alternatives, including potential sale or business combinations, continued investment in its pipeline, and returning excess capital to stockholders [6]. Company Overview - Keros Therapeutics focuses on developing therapeutics targeting disorders linked to dysfunctional signaling of the TGF-ß family of proteins, with lead candidates including KER-065 for neuromuscular diseases and elritercept for cytopenias [8].