Alpine Immune Sciences, Inc., a clinical-stage biopharmaceutical company, focuses on the discovery and development of protein-based immunotherapies for the treatment of cancer, autoimmune/inflammatory disorders, and other diseases. Its product pipeline includes ALPN-101, an inducible T cell costimulator (ICOS)/cluster of differentiation 28 (CD28) antagonist program for the treatment of autoimmune and inflammatory diseases; ALPN-202, a conditional CD28 costimulator and dual checkpoint inhibitor for the treatment of cancer; and ALPN-303, a dual B cell cytokine antagonist for the treatment of B cell-mediated inflammatory and autoimmune diseases. The company has a collaboration agreement with AbbVie Ireland Unlimited Company for the development of ALPN-101; and Adaptimmune Therapeutics plc to develop next-generation SPEAR T cell products. Alpine Immune Sciences, Inc. was incorporated in 2007 and is headquartered in Seattle, Washington.