Combretastatin A-4 (CA-4) is one of the most potent antimitotic and antiangiogenic agents of natural origin. It has displayed potent antitumor effect in a wide variety of preclinical tumor models. Till date various CA-4 analogs have been synthesized and evaluated for anticancer activity. This review is an attempt to compile the medicinal chemistry of various synthesized CA-4 analogs.

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Chelates are used in cancer as cytotoxic agent, as radioactive agent in imaging studies and in radioimmunotherapy.Various chelates based on ruthenium, copper, zinc, organocobalt, gold, platinum, palladium, cobalt, nickel and iron are reported as cytotoxic agent. Monoclonal antibodies labeled with radioactive metals such as yttrium-90, indium-111 and iodine-131 are used in radioimmunotherapy. This review is an attempt to compile the use of chelates as cytotoxic drugs and in radioimmunotherapy.