ROCHESTER, Minn. -- An international team of researchers led by Mayo Clinic have designed a technique that uses the bodys own cells and a virus to destroy cancer cells that spread from primary tumors to other parts of the body through the lymphatic system. In addition, their study shows that this technology could be the basis for a new cancer vaccine to prevent cancer recurrence.
The study appeared in the Dec. 9 online issue of Nature Medicine.
The technology combines infection-fighting T-cells with the vesicular stomatitis virus that targets and destroys cancer cells while leaving normal cells unharmed. The study, which has not yet been replicated in humans, is significant because it describes a potential new therapy to treat and prevent the spread of cancer in patients.
We hope to translate these results into clinical trials. However, until those trials are done, its difficult to be certain that what we see in mouse models will clearly translate to humans. Were hopeful that will be the case, says Richard Vile, Ph.D., a Mayo Clinic specialist in molecular medicine and immunology and the studys principal investigator.
In primary cancers of the breast, colon, prostate, head and neck and skin, the growth of secondary tumors often pose the most threat to patients, not the primary tumor. The prognosis for these patients often depends upon the degree of lymph node involvement and whether the cancer has spread.
Dr. Vile and colleagues theorized that they could control the spread of cancer through the lymphatic system (bone marrow, spleen, thymus and lymph nodes) by manipulating the immune system.
Researchers zeroed in on immature T-cells from bone marrow, programming them to respond to specific threats to the immune system while delivering a cancer-destroying virus to the tumor cells.
To deliver the virus, researchers removed T-cells from a healthy mouse, loaded them with the virus and injected the T-cells back into the mouse. Researchers found that once the T-cells returned to the lymph nodes and spleen, the virus detached itself from the T-cells, found the tumor cells, selectively replicated within them and extracted tumor cells from those areas.
The procedure used in this study triggered an immune response to cancer cells, which means that it could be used as a cancer vaccine to prevent recurrence.
We show that if you kill tumor cells directly in the tumor itself, you can get a weak immunity against the tumor, but if you use this virus to kill tumor cells in the lymph nodes, you get a higher immunity against the tumor, Dr. Vile says.
The technique used in this study successfully treated the cells of three different diseases: melanoma, lung cancer and colorectal cancer. The results include:
The technology already exists to extract T-cells from patients, attach the virus and inject the cells back into the patients. Doctors currently use a similar process to attach radioactive tracers to T-cells when trying to find the source of an infection in patients.
This is technology that is relatively easy to translate to humans because it involves taking T-cells from the patient -- something routinely done today -- loading them with this virus and then putting those T-cells back into patients whose cancer has spread to lymph nodes, are at high risk of the cancer spreading to other parts of the body or are at high risk of succumbing to the cancer, Dr. Vile says.
|Contact: Amy Reyes|