A benzonapthyridine Toll-like receptor (TLR) 7 agonist that is adsorbed to aluminum hydroxide with immunostimulating and potential antitumor activities. Upon intratumoral administration of TLR7 agonist LHC165, the agent is slowly released and targets, binds to and activates TLR7. This may trigger, in addition to other possible responses, the activation of cluster of differentiation (CD) 8+ T cells and natural killer (NK) cells, the blockage of the suppressive function of regulatory T cells (Tregs), and the production of interferon alpha (IFNa). TLR7 is a member of the TLR family, which plays a fundamental role in pathogen recognition and activation of innate immunity.