A clinical trial using a patient's own immune system to produce remissions in adults with acute leukemia could be a major breakthrough in the fight against all different kinds of cancer.

The new study, published Wednesday in the journal Science Translational Medicine, took five patients with untreatable cancer, and using their own immune systems, injected genetic material into the patient's white cells to turn them into cancer fighters. The modified white cells then went out in the body and destroyed all the cancer cells, causing the patients to go into remission, according to the study.

"Cancer cells are similar enough to your normal cells that the T-cells cannot recognize it," Dr. Richard M. Stone, Program Director of the Adult Leukemia Program at the Dana-Farber Cancer Institute, told ABC News. "By injecting genes into these cells, you're educating the immune system to recognize the cancer."

This study only reviewed patients with acute lymphoblastic leukemia. While 80 to 90 percent of children with ALL can be cured with conventional therapy, adult ALL is genetically different and only enjoys a cure rate of roughly 40 percent.

Of the five patients, four had bone marrow transplants after receiving the new treatment. The other patient suffered medical problems that made a transplant impossible, relapsed and died shortly thereafter.

One of the patients, known in the study as Patient 5, is David Aponte, 58, a sound man at ABC News.

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Last summer, Aponte underwent a physically and emotionally taxing regimen of chemotherapy. However, while still undergoing treatment, doctors discovered that the disease was back. With few options left, he decided to join the new T-cell study.

Doctors took millions of Aponte's disease-fighting white blood cells, and used a retrovirus to change those cells into targeted cancer fighters. The treatment can cause side effects, including what is known as a "cytokine storm," in which the engineered T-cells become activated, releasing all kinds of proteins that can make the patient ill. For Aponte, this meant a drop in blood pressure, a fever that spiked to 105 degrees and a coma that lasted eight days.

"Down the road if this continues to be developed, one could imagine therapies that would modulate the side effects, slowing down the anti-tumor response," explained Dr. Stone.

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Gene Therapy Could Treat Cancer

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