Medicine: Viruses & Leukemia

The theory that viruses are to blame for some forms of human cancer, especially leukemia, was strengthened last week by striking evidence gained from experiments with human volunteers. Most notable: the tests gave reason for increased hope that it may be possible to prevent leukemia with a vaccine.

That viruses cause some forms of mouse leukemia has long been accepted, but years of the most exacting research failed to turn up viruses in human victims of a similar disease, acute leukemia. Probably, reasoned Dr. Steven O. Schwartz of Chicago's Hektoen Institute, this was because...

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