PD 166793 is a selective inhibitor of matrix metalloproteinases (MMPs), primarily used in research settings to study its effects on cellular processes, particularly in the context of cancer, inflammation, and osteoarthritis. It targets MMPs involved in pathological processes such as tumor invasion, metastasis, angiogenesis, and tissue remodeling. Researchers utilize it to explore potential therapeutic applications, including inhibiting tumor growth, reducing inflammatory responses, and preventing cartilage degradation. Its role in modulating key biological mechanisms makes it a valuable tool for understanding disease pathology and developing targeted treatments. Additionally, it is employed in preclinical studies to assess its efficacy and safety profile before considering clinical trials.