Pandion Therapeutics, Inc., a clinical stage biopharmaceutical company, develops various therapeutics to address the unmet needs of patients suffering from autoimmune diseases. Its lead product candidate is PT101, an effector module comprising an engineered variant of wild-type interleukin-2 (IL-2) fused to a protein backbone that is in Phase 1a clinical trials for the treatment of various autoimmune and inflammatory diseases. The company's other product candidates comprise PT627, a systemic PD-1 agonist that is in preclinical studies for the treatment of autoimmune diseases; PT001, a bifunctional molecule combining its PD-1 agonist effector with a tether module that binds to mucosal vascular addressing cell adhesion molecule (MAdCAM) to drive tissue-selective immunomodulation in the gastrointestinal tract; and PT002, a tethered bifunctional molecule that utilizes its IL-2 mutein effector module coupled with a MAdCAM-tether module to deliver the IL-2 mutein effector to the gastrointestinal tract where MAdCAM is expressed. It has a license and collaboration agreement with Astellas Pharma Inc. to discover and develop novel compounds for autoimmune diseases of the pancreas, including type 1 diabetes. The company was formerly known as Immunotolerance, Inc. and changed its name to Pandion Therapeutics, Inc. in June 2017. Pandion Therapeutics, Inc. was incorporated in 2016 and is headquartered in Watertown, Massachusetts. As of April 1, 2021, Pandion Therapeutics, Inc. operates as a subsidiary of Merck Sharp & Dohme Corp.