Cyclocreatine phosphate is an anti-tumor agent. Cyclocreatine phosphate(CCrP) is the proposed active form of cyclocreatine (CCr), a substrate analogue of creatine kinase. Cyclocreatine and its water-soluble derivative, cyclocreatine phosphate (CCrP), are potent cardioprotective drugs. Cyclocreatine phosphate can be used for the research of cancer[1].