http://www.pbs.org/newshour/bb/experimental-therapy-trains-immune-cells-hunt-kill-blood-cancers/
"...TONY DEMARCO: They put you on a machine similar to a dialysis machine, where they will have one line in one arm, and one line in the other arm, and it takes your blood out through the machine, and through a centrifuge.
JACKIE JUDD: From there, T cells, part of the body’s immune system, are extracted from the patient’s blood and genetically altered to recognize leukemia. The T cells are modified with deactivated HIV, the very same virus that causes AIDS.
In this case, the HIV is doing good. The so-called hunter cells are then put back in the patient.
David Porter treats DeMarco and other adults in the trials.
DR. DAVID PORTER, Perelman School of Medicine, University of Pennsylvania: This virus is very efficient at getting into the T cells and into the immune cells.
I use an analogy when I explain this to my patients, that a cancer cell has a piece of Velcro stuck on it, but the T cell doesn’t have the other piece of Velcro to stick together. We’re genetically changing that T cell to put a new piece of Velcro on the outside, so now it can see, and recognize, and stick to the cancer cell, and start killing it..."