Leukemia-fighting gene therapy has ups (it usually works) and downs ($475K price, brutal side effects) – The Mercury News

 In Health

By LAURAN NEERGAARD, AP Medical Writer

WASHINGTON – Opening a new era in cancer care, U.S. health officials have approved a breakthrough treatment that genetically engineers patients’ own blood cells into an army of assassins to seek and destroy childhood leukemia.

The Food and Drug Administration said the approval on Wednesday was historic, the first gene therapy to hit the U.S. market. Made from scratch for every patient, it’s one of a wave of “living drugs” under development to fight additional blood cancers and other tumors, too.

Novartis Pharmaceuticals set the price for its one-time infusion of so-called “CAR-T cells” at $475,000, but said there would be no charge for patients who didn’t show a response within a month.

“This is a brand new way of treating cancer,” said Dr. Stephan Grupp of Children’s Hospital of Philadelphia, who treated the first child with CAR-T cell therapy – a girl who’d been near death but now is cancer-free for five years and counting. “That’s enormously exciting.”

CAR-T treatment uses gene therapy techniques not to fix disease-causing genes but to turbocharge T cells, immune system soldiers that cancer too often can evade. Researchers filter those cells from a patient’s blood, reprogram them to harbor a “chimeric antigen receptor” or CAR that zeroes in on cancer, and grow hundreds of millions of copies. Returned to the patient, the revved-up cells can continue multiplying to fight disease for months or years.

It’s a completely different way to harness the immune system than popular immunotherapy drugs called “checkpoint inhibitors” that treat a variety of cancers by helping the body’s natural T cells better spot tumors. CAR-T cell therapy gives patients stronger T cells to do that job.

“We’re entering a new frontier in medical innovation with the ability to reprogram a patient’s own cells to attack a deadly cancer,” said FDA Commissioner Scott Gottlieb.

The first CAR-T version, developed by Novartis and the University of Pennsylvania, is approved for use by several hundred patients a year who are desperately ill with acute lymphoblastic leukemia, or ALL. It strikes more than 3,000 children and young adults in the U.S. each year and while most survive, about 15 percent relapse despite today’s best treatments.

In a key study of 63 advanced patients, 83 percent went into remission soon after receiving the CAR-T cells. Importantly, it’s not clear how long that benefit lasts: Some patients did relapse months later. The others still are being tracked to see how they fare long-term.

Still, “a far higher percentage of patients go into remission with this therapy than anything else we’ve seen to date with relapsed leukemia,” said Dr. Ted Laetsch of the University of Texas Southwestern Medical Center, one of the study sites. “I wouldn’t say we know for sure how many will be cured yet by this therapy. There certainly is a hope” that some will be.

Most patients suffered side effects that can be grueling, even life-threatening. An immune overreaction called “cytokine release syndrome” can trigger high fevers, plummeting blood pressure and in severe cases organ damage, side effects that require sophisticated care to help patients without blocking the cancer attack. The FDA designated a treatment for those side effects Wednesday.

“This is remarkable technology,” said Dr. Mikkael Sekeres of the American Society of Hematology. But, he cautioned that CAR-T “isn’t a panacea.”

Among concerns, sometimes leukemia can develop resistance, and sometimes patients worsen while waiting for their new cells, said Sekeres, who directs the Cleveland Clinic’s leukemia program and wasn’t involved with CAR-T testing.

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