<p>From the National Cancer Institute. <a rel="nofollow" class="external autonumber" href="http://press2.nci.nih.gov/sciencebehind/cancer/cancer01.htm">[1]</a>
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<a href="https://en.wikipedia.org/wiki/vi:H%C3%ACnh:Cancer_requires_multiple_mutations_from_NIH-vi.png" class="extiw" title="en:vi:Hình:Cancer requires multiple mutations from NIH-vi.png">en:vi:Hình:Cancer requires multiple mutations from NIH-vi.png</a>
<a rel="nofollow" class="external text" href="http://press2.nci.nih.gov/sciencebehind/cancer/cancer01.htm">National Cancer Institute</a>