Cancer cells vs. normal cells

Cancer cells are different from normal cells in some aspects
They do not remain confined to one part of the body
They penetrate and infiltrate into the adjoining tissues and dislocate their function
Some of the cancer cells get detached from the main mass or site of origin and travel by blood cell and lymph channels to sites distant from the original tumor and form fresh colonies, called metastasis or secondary growths, in other organs where they grow at the cost of the normal cells
This is how they destroy the well-regulated functioning of the body and bring about its end