Studies have shown that 18F-rhPSMA-7 and 18F-rhPSMA-7.3 PET have a detection rate of 81.3% for lymph node metastasis in BCR patients after RP, and their accuracy in evaluating lymph node metastasis is comparable to that of 18F-PSMA-11 (78).PSMA-PET/CT has higher diagnostic accuracy for lymph node recurrence after RP, especially for small-volume metastases, 18 F-PSMA-1007 PET/CT can reliably detect malignant lymph nodes larger than 3 mm with a specificity of over 99% (79–81) (Figure 3). Here, FOLH1 is linked to metastatic malignant neoplasm in the lymph nodes.