Multiple steps: Changes in the dna of cells, some changes may be inherited, increase the growth rate of cells and additional changes to the 'dna develop and select for more growth. Many incipient cancers probably die out in the process. As more dna changes promoting growth accumulate the abnormal cells become autonomous, invade and metastasize. On average a cancer has 90 dna changes/mutations.
Answered 6/10/2012
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