Jounce Therapeutics, Inc. announced that the company completed enrollment in the first cohort for its Phase 1 dose escalation clinical trial of JTX-4014 as monotherapy in patients with solid tumors. JTX-4014 is a fully human IgG4 monoclonal antibody designed to specifically bind to PD-1 and block its interaction with its ligands, PD-L1 and PD-L2, to augment anti-tumor T cell activity. Jounce is developing JTX-4014 for potential use in combination with its pipeline of future product candidates.