The first of 2 programs on the latest cancer treatments looks at fluorescence imaging, which causes cancer cells to light up. It's now widely used in Japan for liver cancer surgery. Cancer cells glow, showing the size and location of tumors and making precise surgery possible. Technology is being developed for its use on other cancers such as breast cancer. It will enable surgeons to tell simply by looking at an incision made during an operation if any cancer cells remain in the body.