Radiolabeled conjugates are disclosed which have a component that is effective to target tumor cells, which cells selectively take up and degrade the conjugate, thereby delivering to the tumor cell nucleus a radioisotope capable of being incorporated into the nuclear material, so as to produce a cytotoxic effect and/or to render the cell detectable by radioimaging.

 
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> 2,7-substituted octahydro-1H-pyrido[1,2-a]pyrazine derivatives as ligands for serotonin receptors

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