Aptevo Therapeutics, Inc. is a clinical-stage biotechnology company, which engages on developing novel immunotherapies for the treatment of cancer. Its pipeline APVO436, ALG.APV-527, and APVO603 were developed based on the ADAPTIR modular protein platform technology and APVO442 was developed based on the new ADAPTIR-FLE platform technology. The ADAPTIR and ADAPTIR-FLEX are capable of generating differentiated bispecific and multi-specific antibodies with potentially unique mechanisms of action for the treatment of different types of cancer. The company was founded in February 2016 and is headquartered in Seattle, WA.