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CANCER
Webster's Definition: 1 a : "a
malignant tumor of potentially unlimited growth that expands locally by
invasion and systemically by metastasis." b :
"an abnormal bodily state marked by such tumors." 2 :
"something evil or malignant that spreads destructively" <the cancer
of hidden resentment -- Irish Digest> 3 a :
"an enlarged tumor-like plant growth" (as that of crown gall)
b : "a plant disease marked by such growths." What is Cancer? CANCER
OCCURS when cell division gets out of control. Usually, the timing of
cell division is under strict constraint, involving a network of signals
that work together to say when a cell can divide, how often it should happen
and how errors can be fixed. Mutations in one or more of the nodes in this
network can trigger cancer, be it through exposure to some environmental
factor (e.g. tobacco smoke) or because of a genetic predisposition, or both.
Usually, several cancer-promoting factors have to add up before a person
will develop a malignant growth: with some exceptions, no one risk alone is
sufficient. Informative Links About Cancer |
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