Used primarily in research settings as a selective inhibitor of matrix metalloproteinases (MMPs), particularly MMP-2 and MMP-9. These enzymes are involved in the degradation of extracellular matrix components and play key roles in processes such as tumor invasion, angiogenesis, and inflammation. YM 90K hydrochloride is therefore employed to study the role of MMPs in cancer progression, metastasis, and other pathological conditions involving tissue remodeling. It has also been investigated for its potential to suppress tumor growth and invasion in preclinical models, making it a valuable tool in oncology and pharmacology research. Additionally, it aids in understanding the mechanisms of connective tissue diseases and cardiovascular disorders where MMP activity is dysregulated.