Disclosed are compositions and methods relating to prostate cancer. In particular, disclosed are bivalent targeting ligands that specifically bind prostate specific membrane antigen and gastrin-releasing peptide receptor. Bivalent binding agents disclosed herein can be used to image a tissue in a subject in need thereof and to diagnose prostate cancer in a subject in need thereof. Bivalent binding agents disclosed herein can be used to treat prostate cancer in a subject in need thereof.
