In fact, [89Zr]Zr-DFO-MSTP2109A anti-STEAP1 antibody proved to be well tolerated and adequate for positron emission tomography bioimaging in PCa, being able to track changes in STEAP1 expression, and consequently, tracking the progression of PCa [13,14,15]. The gene discussed is STEAP1; the disease is posterior cortical atrophy.