Cancer cells can go mysteriously dormant for years, and scientists are beginning to understand why

Cancer cells can go mysteriously dormant for years, and scientists are beginning to understand why: "Cancer has always been thought of as something that grows rapidly and uncontrollably, but this view may be wrong.
New evidence suggests that cancer alternatively uses the "accelerator" and the "brake" in order to survive.
If you plot the growth of prostate cancer tumour progression over years, you get a graph that looks something like this:

The graph shows that prostate cancer cells alternate periods of rapid growth with periods of dormancy. 
In the above example, the tumour will grow to the point where it starts to produce symptoms and the patient seeks treatment – which usually involves cutting the tumour out.
Surgery is often effective but, for some unfortunate patients, their cancer will return."...
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