A toll-like receptor type 7 and 8 (TLR7/8) agonist with potential immunostimulating and antitumor activities. Upon intratumoral administration, TLR7/8 agonist MEDI9197 binds to and activates TLR7 and 8, thereby stimulating antigen-presenting cells (APCs), including dendritic cells (DCs). Activation of DCs results in the production of proinflammatory cytokines, and the activation of cytotoxic T-lymphocyte (CTL) and B-lymphocyte immune responses. This may cause tumor cell lysis. TLR7 and 8, members of the TLR family, play fundamental roles in the activation of the immune system. Check for active clinical trialsusing this agent.