Doctors are reporting unprecedented success from a new cell and gene therapy for multiple myeloma, a blood cancer that's on the rise. Although it's early and the study is small 35 people every patient responded and all but two were in some level of remission within two months.

In a second study of nearly two dozen patients, everyone above a certain dose responded.

Experts at an American Society of Clinical Oncology conference in Chicago, where the results were announced Monday, say it's a first for multiple myeloma and rare for any cancer treatment to have such success.

Chemotherapy helps 10 to 30 percent of patients; immune system drugs, 35 to 40 percent at best, and some gene-targeting drugs, 70 to 80 percent, "but you don't get to 100," said Dr. Len Lichtenfeld, deputy chief medical officer of the American Cancer Society.

"These are impressive results" but time will tell if they last, he said.

ABOUT THE DISEASE

Multiple myeloma affects plasma cells, which make antibodies to fight infection. More than 30,000 cases occur each year in the United States, and more than 115,000 worldwide. It's the second fastest growing cancer for men and the third for women, rising 2 to 3 percent per year, according to the National Cancer Institute. About 60,000 to 70,000 Americans have it now.

Nine new drugs have been approved for it since 2000 but they're not cures; only about half of U.S. patients live five years after diagnosis.

With cell therapy, "I can't say we may get a cure but at least we bring hope of that possibility," said Dr. Frank Fan. He is chief scientific officer of Nanjing Legend Biotech, a Chinese company that tested the treatment with doctors at Xi'an Jiaotong University.

HOW IT WORKS

The treatment, called CAR-T therapy , involves filtering a patient's blood to remove immune system soldiers called T cells. These are altered in a lab to contain a gene that targets cancer and then given back to the patient intravenously.

Doctors call it a "living drug" a one-time treatment to permanently alter cells that multiply in the body into an army to fight cancer. It's shown promise against some leukemias and lymphomas, but this is a new type being tried for multiple myeloma, in patients whose cancer worsened despite many other treatments.

THE STUDIES

In the Chinese study, 19 of 35 patients are long enough past treatment to judge whether they are in complete remission, and 14 are. The other five had at least a partial remission, with their cancer greatly diminished. Some are more than a year past treatment with no sign of disease.

Most patients had a group of side effects common with this treatment, including fever, low blood pressure and trouble breathing. Only two cases were severe and all were treatable and temporary, doctors said.

The second study was done in the U.S. by Bluebird Bio and Celgene, using a cell treatment developed by the National Cancer Institute. It tested four different dose levels of cells in a total of 21 patients. Eighteen are long enough from treatment to judge effectiveness, and all 15 who got an adequate amount of cells had a response. Four have reached full remission so far, and some are more than a year past treatment.

WHAT EXPERTS SAY

The results are "very remarkable" not just for how many responded but how well, said Dr. Kenneth Anderson of Dana-Farber Cancer Institute in Boston.

"We need to be looking for how long these cells persist" and keep the cancer under control, he said.

Dr. Carl June, a University of Pennsylvania researcher who received the conference's top science award for his early work on CAR-T therapy, said "it's very rare" to see everyone respond to a treatment. His lab also had this happen all 22 children testing a new version of CAR-T for leukemia responded, his colleagues reported at the conference.

"The first patients we treated in 2010 haven't relapsed," June said.

Dr. Michael Sabel of the University of Michigan called the treatment "revolutionary."

"This is really the epitome of personalized medicine," extending immune therapy to more types of patients, he said.

NEXT STEPS

Legend Biotech plans to continue the study in up to 100 people in China and plans a study in the U.S. early next year. The treatment is expected to cost $200,000 to $300,000, and "who's going to pay for that is a big issue," Fan said.

"The manufacturing process is very expensive and you can't scale up. It's individualized. You cannot make a batch" as is done with a drug, he said.

Nick Leschly, Bluebird's chief executive, said the next phase of his company's study will test what seems the ideal dose in 20 more people.

Marilynn Marchione can be followed at http://twitter.com/MMarchioneAP

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A first: All respond to gene therapy in a blood cancer study - ABC News