Oncopeptides AB is a pharmaceutical company, which is involved in the development of targeted therapies for hematological diseases. The firm focuses on its product candidate melflufen, a peptide conjugated alkylator, belonging to a new class of drugs called peptidase enhanced cytotoxics, which targets aminopeptidases and rapidly releases alkylating agents into tumor cells. The company was founded by Rolf Larsson, Rolf Lewensohn, Joachim Gullbo, Kristina Luthman, Hans Ehrsson, and Peter Nygren on September 5, 2000 and is headquartered in Stockholm, Sweden.