Scientists know that cancer arises when a cell undergoes several molecular
changes. These changes take place over many years, and only when the cell has
accumulated a critical number of these changes does it become a "cancer" cell.
In 1996, the Cancer Genome Anatomy Project (CGAP) began. This program of the
National Cancer Institute (NCI) is studying the molecular changes that occur
when a normal cell is transformed into a cancer cell.
![Enter CGAP: NCI's Program To Study Molecular Changes in Cancer](https://webarchive.library.unt.edu/eot2008/20090131032944im_/http://newscenter.cancer.gov/images/Documents/5d8fef4b-34da-44ba-8087-191d81c95c88/cancer3.jpg)
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