FOLH1 and metastatic malignant neoplasm in the lymph nodes: Specifically, among patients who were non-metastatic according to CT (N0M0, n = 52), PSMA-PET/CT identified regional lymph node metastases (N1M0) in 25% of cases (13/52) and distant metastases (M1a/b) in an additional 25% of cases (13/52).