FOLH1 and neoplasm: Overall, we found that the correlation of ADC values was stronger between tumor size on histopathology than ISUP grade (r =  − 0.523, p < 0.001 vs r =  − 0.192, p = 0.135), while PSMA uptake was more dependent on ISUP grade than tumor size (r = 0.508, p < 0.001 vs r = 0.342, p = 0.006).