Cancer invasion refers to the process by which cancer cells spread from their original location to surrounding tissues and organs in the body. This process is a critical step in the progression of cancer and is responsible for the majority of cancer-related deaths. Understanding the mechanisms of cancer invasion is essential for developing effective treatments and strategies to prevent the spread of cancer cells. Research in this area involves studying the molecular and cellular mechanisms that regulate cancer cell invasion, as well as identifying potential targets for intervention to halt or slow down the spread of cancer. Techniques such as imaging, genetic analysis, and cell culture models are commonly used in cancer invasion research.