...the treatment made the most common type of leukemia completely disappear in two of the patients and reduced it by 70 percent in the third...


In the Penn experiment, the researchers removed certain types of white blood cells that the body uses to fight disease from the patients. Using a modified, harmless version of HIV, the virus that causes AIDS, they inserted a series of genes into the white blood cells.  These were designed to make to cells target and kill the cancer cells.  After growing a large batch of the genetically engineered white blood cells, the doctors injected them back into the patients.

In similar past experimental treatments for several types of cancer the re-injected white cells killed a few cancer cells and then died out. But the Penn researchers inserted a gene that made the white blood cells multiply by a thousand fold inside the body. The result, as researcher June put it, is that the white blood cells became “serial killers” relentlessly tracking down and killing the cancer cells in the blood, bone marrow and lymph tissue...

Quoted:
Isn't that what they did in I am legend?

Quoted:


Beat me to it