The SV40 was known to cause cancer tumors to develop in mice.

There is also the problem that not all cancer tumors can be felt when they are small.

In 1980, the first such patent was awarded, for a rat with genes that created cancer tumors.

Yan went to the doctors and found out that she had a cancer tumor in her brain.

His work involved searching for viral "footprints" in human and animal cancer tumors.

The cancer tumor was greatly reduced in December 2005 and January 2006.

Dravecky, 35 years old, has undergone three operations to remove cancer tumors from the arm, most recently in May 1990.

That makes it a promising treatment for killing cancer tumors.

New technology is being developed which allows researchers to see cancer tumours through flesh.

Some American and Asian universities also study the effect in reduction of cancer tumors.