PET with fluorodeoxy glucose combined with computed tomography is a major tool for the diagnosis, staging, and monitoring of treatment response in clinical oncology. 3'-18Fluoro-3'-deoxy-L-thymidine (18F-FLT) is a PET radiotracer that quickly accumulates in proliferating cells and can be used to assess tumor cell proliferation in various cancers as PET radiotracer offers a non-invasive assessment of cell proliferation in vivo.