I've written a couple of times about the work at the University of Pennsylvania on modified T-cell therapy for leukemia (CLL). Now comes word that a different version of this approach seems to be working at Sloan-Kettering. Recurrent B-cell acute lymphoblastic leukemia (B-ALL) has been targeted there, and it's generally a more aggressive disease than CLL.
As with the Penn CLL studies, when this technique works, it can be dramatic:
One of the sickest patients in the study was David Aponte, 58, who works on a sound crew for ABC News. In November 2011, what he thought was a bad case of tennis elbow turned out to be leukemia. He braced himself for a long, grueling regimen of chemotherapy.
Brentjens suggested that before starting the drugs, Aponte might want to have some of his T-cells stored (chemotherapy would deplete them). That way, if he relapsed, he might be able to enter a study using the cells. Aponte agreed.
At first, the chemo worked, but by summer 2012, while he was still being treated, tests showed the disease was back.
“After everything I had gone through, the chemo, losing hair, the sickness, it was absolutely devastating,’’ Aponte recalled.
He joined the T-cell study. For a few days, nothing seemed to be happening. But then his temperature began to rise. He has no memory of what happened for the next week or so, but the journal article — where he is patient 5 — reports that his fever spiked to 105 degrees.
He was in the throes of a ‘‘cytokine storm,’’ meaning that the T-cells, in a furious battle with the cancer, were churning out enormous amounts of hormones called cytokines. Besides fever, the hormonal rush can make a patient’s blood pressure plummet and his heart rate shoot up. Aponte was taken to intensive care and treated with steroids to quell the reaction.
Eight days later, his leukemia was gone
He and the other patients in the study all received bone marrow transplantations after the treatment, and are considered cured - which is remarkable, since they were all relapsed/refractory, and thus basically at death's door. These stories sound like the ones from the early days of antibiotics, with the important difference that resistance to drug therapy doesn't spread through the world's population of cancer cells. The modified T-cell approach has already gotten a lot of attention, and this is surely going to speed things up even more. I look forward to the first use of it for a non-blood-cell tumor (which appears to be in the works) and to further refinements in generating the cells themselves.