FGFR4-IN-1 is primarily used in research settings to study the role of FGFR4 (Fibroblast Growth Factor Receptor 4) in various biological processes. It is a selective inhibitor of FGFR4, making it a valuable tool for investigating the receptor's involvement in cancer progression, particularly in cancers where FGFR4 signaling is dysregulated, such as hepatocellular carcinoma and breast cancer. Researchers utilize FGFR4-IN-1 to explore potential therapeutic strategies by blocking FGFR4 activity, which may help in understanding tumor growth, metastasis, and resistance to treatments. Additionally, it aids in identifying the downstream signaling pathways affected by FGFR4 inhibition, contributing to the development of targeted cancer therapies.