Scientists will, now, be able to understand the movement of cells in the area around tumors (tumor microenvironment) in a better way. Researchers at University of California, San Francisco used optimized methods of laser microscopy to track the movement of live cells in a mouse model of breast cancer. Cancerous growth is supported by some normal cells while the immune cells protect the body against the tumor. The study aims to identify drug targets which can be withdrawn to prevent cancer and stimulate those that enhance the immunity of body towards the disease.