Cu-ATSM is primarily used in medical imaging and cancer treatment. It is a radioactive copper complex that helps in visualizing hypoxic regions in tumors, which are areas with low oxygen levels. This is crucial for diagnosing and planning treatment strategies for cancer, as hypoxic tumors are often more resistant to radiation therapy. Additionally, Cu-ATSM is being researched for its potential therapeutic applications, particularly in delivering targeted radiation to cancer cells, thereby enhancing the effectiveness of treatment while minimizing damage to healthy tissues. Its ability to selectively accumulate in hypoxic cells makes it a promising tool in both diagnostic and therapeutic oncology.