Immunotherapy: The next frontier in cancer treatment

The effort to unlock the secret within the human immune system is already offering new hope to cancer patients for whom traditional treatments have fallen short. Dr. Jon LaPook reports: 

Twelve-year old Ezzy Pineda will tell you what happened to her seems like a miracle.

How is she now? “Feeling great,” she told Dr. LaPook. “I feel like I could do anything.”

Back when she was just nine, feeling weak and dizzy, she was taken to a hospital on Long Island, where doctors gave her a diagnosis she barely understood: leukemia.

“I’m like, ‘Am I gonna die? Am I gonna live? Am I gonna be able to do the stuff I did before?’”

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Ezzy Pineda, with Dr. Jon LaPook.

CBS News

Ninety-eight percent of children with this form of cancer respond well to chemotherapy, so her doctors started there. But after four brutal rounds, Ezzy’s cancer was getting worse.

“It was very scary,” she said. “I was like, ‘What did I do bad so that God could give me this punishment?’”

Desperate and out of options, Ezzy had one last chance. She was enrolled in a clinical trial at Memorial Sloan Kettering Cancer Center in Manhattan for an experimental treatment called CAR-T.

After six weeks, Dr. Kevin Curran, the pediatric oncologist who treats Ezzy, couldn’t find a single leukemia cell … not one. That is a patient who ten years earlier would have been told, “There’s nothing we can do.”

Ezzy is healthy -- just a little puffy from steroids -- because of a promising new frontier in the war on cancer: Immunotherapy, using a patient’s own immune system to find and kill cancer cells.

One of the biggest challenges in fighting cancer has been that cancer cells find ways of becoming invisible to the body’s defenses. And the immune system can’t kill what it can’t see. So doctors, in essence, taught Ezzy’s immune system to “see.”

They took billions of her white blood cells -- cells that normally are good at destroying invaders like bacteria and viruses, but bad at fighting cancer -- and turned them into cancer-killers.

“We can take those cells out of the body, genetically modify them, teach them how to fight cancer, and then infuse them back into the patient,” Dr. Curran said.

“It’s like they’re bloodhounds, and you give them the scent of the cancer?”

“Exactly.”

Traditional therapies like chemo and radiation often damage healthy tissue along with cancer cells. The hope is immunotherapy will be more targeted, usually sparing normal tissue. But there have been serious side-effects, even death.

“Once we knew it could work, we’ve been working around the clock,” said Dr. Steven Rosenberg, who has been a pioneer in the field of immunotherapy at the National Cancer Institute for more than four decades. In 1984, he was the first doctor to cure a dying patient using her own immune system. 

But he’ll also be the first to tell you that, all these years later, immunotherapy is still in its infancy.

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Dr. Steven Rosenberg, a pioneer in the study of immunotherapy to fight cancers, at the National Cancer Institute.

CBS News

“We’ve gotten to the point now where I think we understand why the patients who are successfully treated experience tumor regression,” Dr. Rosenberg said. “And based on that knowledge, I think we’re going to see dramatic progress in the next few years to come.”

But most patients don’t have years to wait.

Like 29-year-old Burak Guvensoyler, who has a sarcoma -- a cancer in the connective tissue near his spine -- that has spread to his lungs.

Dr. Rosenberg showed LaPook scans of Guvensoyler’s tumors. “These are all abnormal tumors, every one of these. He has many hundreds of different tumors that are in his lung.”