Leap Therapeutics, Inc. (Nasdaq:LPTX), a biotechnology company focused on developing targeted and immuno-oncology therapeutics, today announced that the U.S. Food and Drug Administration (FDA) has granted Fast Track designation to DKN-01 for the treatment of patients with gastric and gastroesophageal junction (G/GEJ) adenocarcinoma whose tumors express high Dickkopf-1 protein (DKK1), following disease progression on or after prior fluoropyrimidine- and platinum- containing chemotherapy and if appropriate, human epidermal receptor growth factor (HER2)/neu-targeted therapy. DKN-01 is a humanized monoclonal antibody that binds to and blocks the activity of DKK1 protein, a modulator of Wnt/Beta-catenin signaling.