RESULTS Of 32 patients screened, 30 were enrolled into the study and received 68Ga-PSMA-R2. Two patients without BCR or mPC were not enrolled. In phase 1, 6 patients with BCR were enrolled; in phase 2, 24 patients with BCR or mPC (n = 12 each) were enrolled (Supplemental Table 2). All participants completed the imaging assessment on day 1. Most participants were White (90%, 27/30) with a median age of 70.5 y (range, 53–86 y) (Table 1).