68Ga-PSMA-617 SUVmax compared with 68Ga-RM2 SUVmax, according to ISUP groups. Estimates of >1 and <1 indicated higher and lower SUVmax, respectively, with 68Ga-PSMA-617. For ISUP ≥ 4 group, when patient who had only 68Ga-PSMA-617 was excluded, values were 1.32 (95% CI, 0.72–2.44) (P = 0.3459).