State the importance of coordination compounds in medicine.

(N/A) In medicine,coordination compounds are used in chelate therapy to treat problems caused by the presence of toxic levels of metals in plants and animals.
For example,an excess of $Cu$ and $Fe$ is removed by chelating agents such as $D$-penicillamine and desferrioxime $B$ through the formation of stable coordination compounds.
$EDTA$ is used in the treatment of $Pb$ poisoning.
Cis-platin and its related compounds are effectively used to inhibit the growth of tumors.