Cancer is a term
characterized by the uncontrolled growth and spread of cells leading to
invasion of normal tissues. Cancer develops due to the changes caused to normal
cells to acquire abnormal functions.
Inherited
mutations or environmental factors like, X-rays, chemicals, ultraviolet
light, etc are the changes that lead to cancer. So, these facts suggest that
cancer is not a result of a single factor.
It typically,
takes many years to elapse for normal cells to evolve into cancerous cells. In
2012, according to the WHO, the global cancer burden accounted for 14.1 million
new cases and 8.2 million deaths.
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