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ABC News' Dr. Richard Besser has the details on this breakthrough procedure.

Researchers might have found the Holy Grail in the war against cancer, a miracle drug that has killed every kind of cancer tumor it has come in contact with, the New York Post reported.

The drug works by blocking a protein called CD47 that is essentially a "do not eat" signal to the body's immune system, according to

Science Magazine.

This protein is produced in healthy blood cells, but researchers at Stanford University found that cancer cells produced an inordinate amount of the protein thus tricking the immune system into not destroying the harmful cells.

With this observation in mind, the researchers built an antibody that blocked cancer's CD47 so that the body's immune system attacked the dangerous cells.

So far, researchers have used the antibody in mice with human breast, ovary, colon, bladder, brain, liver and prostate tumors transplanted into them. In each of the cases the antibody forced the mice's immune system to kill the cancer cells.

Scientists say they have found dozens of DNA markers that could help predict a person's risk of developing certain types of cancer. It means tests could be used to find people at greatest risk and help them take preventative action. Al Jazeera's Tim Friend reports from London.