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Unformatted text preview: pancreatic cancers. The rasN oncogene is associated with leukemias and lymphomas. These oncogenes stimulate growth even when there is no growth factor produced. Carcinogens Carcinogens are chemicals that cause cancer by causing mutations. Cancer may result if the mutations produce some of the characteristics described above. Generally, chemicals that produce mutations are more likely to cause cancer than those that do not produce mutations. The likelihood that any particular chemical will cause cancer can be determined by observing the rate at which it causes mutations in bacteria. This is the basis of the Ames test....
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- Fall '10