The invention relates to cobalamin derivatives (a) having no binding affinity or low binding affinity to the transport protein transcobalamin II TCII) and (b) retaining activity as a vitamin B12 substitute, optionally carrying a therapeutic and/or diagnostic agent, such as a radioactive metal. These compounds have a much reduced accumulation rate in blood and benign organs, such as kidney and liver, compared to the accumulation rate in neoplastic tissues, and are more rapidly eliminated from blood. The invention further relates to a method of diagnosis and a method of treatment of a neoplastic disease or an infection by microorganisms in a mammal comprising (a) exposing the mammal to a period of a vitamin B12 - free diet, and (b) subsequently applying a cobalamin derivative of the invention carrying a diagnostic and/or therapeutic agent. By selecting cobalamin derivatives acting as vitamin B12 substitutes, the risk of the formation of resistant offspring in neoplastic tissue is much reduced.
该发明涉及一种
钴胺衍
生物(a),其与运输蛋白转
钴胺II(TCII)无结合亲和力或低结合亲和力,并且(b)保留
维生素B12替代物的活性,可选地携带治疗和/或诊断剂,如放射性
金属。与在恶性组织中的积累速率相比,这些化合物在血液和良性器官(如肾脏和肝脏)中的积累速率大大降低,并且更快地从血液中排出。该发明还涉及一种诊断方法和治疗方法,用于治疗哺乳动物中的恶性疾病或由微
生物感染引起的感染,包括(a)使哺乳动物暴露于
维生素B12 - 无食物的饮食期间,以及(b)随后应用携带该发明的
钴胺衍
生物的诊断和/或治疗剂。通过选择作为
维生素B12替代物的
钴胺衍
生物,大大降低了恶性组织中抵抗性后代形成的风险。