People became very
concerned when injected
virus was shown to cause
tumors in a variety of
mammals.
Although there isn't concrete evidence that SV40 causes cancer in humans, SV40 DNA has
been isolated from
several different
types of tumors. It
is highly prevalent in
mesotheliomas
T-antigen, which
is present in the
genome of SV40, is
a powerful
transforming
agent.