PSMA-PET is 1 agent in PET imaging and to understand the evolution of PSMA-PET, you have to go back a little bit and look at how PET imaging evolved in prostate cancer. Traditional PET imaging—positron emission technology, or tomography—is using metabolism to find cancer cells. We began by using FDG or a glucose-based tracer, and so we're really trying to identify metabolically active tumors.
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