Sotatercept (brand name WINREVAIR, developed by Merck) is an activin receptor type IIA-Fc (ActRIIA-Fc), working by sequestering free activins. Sotatercept restores the balance between the activin proliferative pathway and the bone morphogenic protein (BMP) antiproliferative pathway in the pulmonary arterial cirulation. Sotatercept recently received approval in the USA and in Europe for the treatment of adults with pulmonary arterial hypertension (PAH) Group 1, on top of background PAH therapy to increase exercise capacity, improve WHO functional class and reduce the risk of clinical worsening events. Nevertheless, several studies are ongoing to investigate the potential adverse reactions of the drug especially at the haematological level. We provide an overview of the clinical and preclinical evidence of the targeting the activing pathway through sotatercept on the treatment of PAH. We also discuss what other possibilities there are for the application of sotatercept in the setting of pulmonary hypertension other than PAH Group 1.
