Why do cancer cells reproduce so fast?
Would that we knew!! The normal "clock" that determines exactly how fast any
cell divides (reproduces) is well understood by scientists now. And we also know that
in some cancers, certain chemicals that control this clock are abnormal. But why this
happens just isn't clear yet. This is one of the fastest-moving and most important
areas of research in biology right now.
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Update: June 2012