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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.
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