LNS8801 is an orally active agonist of the G protein-coupled estrogen receptor (GPER). By activating GPER, LNS8801 mediates downstream signaling pathways, such as promoting the production of cyclic adenosine monophosphate (cAMP) and activating the cAMP response element-binding protein (CREB) signaling, thereby exerting anti-tumor activities including inhibiting tumor cell proliferation, inducing cell differentiation, and enhancing tumor immunogenicity. LNS8801 can be used in the research of various cancers (e.g., melanoma, pancreatic cancer, colorectal cancer, lung cancer, etc.) and relevant studies exploring the roles of GPER in normal physiological and pathological processes.