This document discusses the role of nuclear medicine in cancer treatment. It begins by outlining cancer's biological features and current treatment methods. It then explains that nuclear medicine uses small amounts of radioactive material attached to pharmaceuticals to diagnose and treat diseases non-invasively. Some key nuclear medicine applications for cancer treatment discussed are using I-131 for thyroid cancer and Graves' disease, Zevalin for non-Hodgkin's lymphoma, TheraSphere for hepatocellular carcinoma, and samarium injections to relieve bone pain. In conclusion, nuclear medicine is producing new therapeutic techniques that can replace other modalities due to being safe, painless, and cost-effective.