Pieris Pharmaceuticals, Inc., a clinical-stage biopharmaceutical company, discovers and develops anticalin-based drugs. The company develops anticalin proteins that are low molecular-weight therapeutic proteins derived from lipocalins, which are naturally occurring low-molecular weight human proteins found in human blood plasma and other bodily fluids. Its lead respiratory Anticalin based drug candidate, elarekibep used for the treatment of asthma; and PRS-220, an oral inhaled Anticalin protein targeting connective tissue growth factor for the treatment of idiopathic pulmonary fibrosis. The company also develops PRS-344/S09501 2that consists of a PD-L1-targeting antibody and 4-1BB-targeting Anticalin proteins. It has a license and collaboration agreement with Les Laboratoires Servier and Institut de Recherches Internationales Servier, AstraZeneca AB, and Seagen Inc.; and license agreements with Technical University of Munich and Sichuan Kelun-Biotech Biopharmaceutical Co. Ltd. Pieris Pharmaceuticals, Inc. was incorporated in 2000 and is headquartered in Boston, Massachusetts.