This is the second in a series of articles looking at the hot topic of the patenting of radiopharmaceuticals. Fluorine-18 (18F), a radioactive isotope of fluorine, is the most common positron-emitting radioisotope used in positron emission tomography (PET) radiopharmaceuticals and fluorodeoxyglucose (18F-FDG) is the most commonly used 18F radiopharmaceutical in cancer detection. However, 18F is not just a workhorse. There are several exciting developments in its use. Read more.