Total-body positron emission tomography imaging to accelerate radiotracer discovery pipelines.

The development of the first total-body positron emission tomography (PET) clinical scanner is a transformational moment in nuclear medicine, reigniting the field by tackling 2 long-standing and critical barriers to the widespread clinical use of PET: radiation dose and patient throughput. Total-body PET also provides several other unique research and clinical opportunities, including potential to streamline radiotracer discovery and development pipelines. PET does not exist without radiotracers. However, despite decades of radiotracer development programs, the number of successful PET radiotracers adopted and approved for human use is extremely low. In neurology, an important area for nuclear medicine, only approximately 4% of all novel radiotracers that survive the radiotracer translational "valley of death" are adopted clinically. The potential for total-body PET technology to reverse these low numbers of radiotracer development and adoption is high. This will require the PET community to come together with the regulators to chart new frameworks for radiotracer development and translational pipelines. This article will discuss which stages of the radiotracer discovery pipeline can benefit most from the recent development of total-body PET technology. It will review the latest key developments in radiochemistry modernization and describe how these could ameliorate regulatory hurdles and deliver the groundbreaking potential of total-body PET. Finally, this article will highlight emerging radiotracer discovery opportunities that could be rapidly facilitated by total-body PET. SIGNIFICANCE STATEMENT: In addition to creating new opportunities for clinical research and patient care, total-body positron emission tomography technology can also embolden radiochemistry modernization in the clinic and break long-standing translational barriers encountered during radiotracer discovery pipelines.