In 1970 Bishop teamed up with Varmus, and they set out to test the theory that healthy body cells contain dormant viral oncogenes that, when triggered, cause cancer. Working with the Rous sarcoma virus, known to cause cancer in chickens, Bishop and Varmus found that a gene similar to the cancer-causing gene within the virus was also present in healthy cells.
In 1976 Bishop and Varmus, together with two colleagues--Dominique Stehelin and Peter Vogt--published their findings, concluding that the virus had taken up the gene responsible for the cancer from a normal cell. After the virus had infected the cell and begun its usual process of replication, it incorporated the gene into its own genetic material. Subsequent research showed that such genes can cause cancer in several ways. Even without viral involvement, these genes can be converted by certain chemical carcinogens into a form that allows uncontrolled cellular growth.
Because the mechanism described by Bishop and Varmus seemed common
to all forms of cancer, their work proved invaluable to cancer research.
By 1989 scientists had identified more than 40 genes having cancer-causing
potential in animals.
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