Recently, we developed a series of targeted cytotoxic conjugates based on analogues of peptide hormones such as luteinizing hormone-releasing hormone(LH-RH), somatostatin and BN/GRP, for which high affinity receptors are expressed on a variety of tumours (Schally and Nagy, 1999; Nagy and Schally, 2001). The gene discussed is SST; the disease is neoplasm.