GRP and metastatic malignant neoplasm in the lymph nodes: Kahkonen et al. reported the first in-human study of 68Ga-bombesin antagonist BAY867548, in which PET imaging successfully detected all dominant lesions with an accuracy of 83% for detection of the organ-confined disease and 70% sensitivity in the detection of lymph node metastases in human subjects with histologically confirmed prostate adenocarcinoma [26].