"Therapy with EBV-specific CTLs (cytotoxic lymphocytes) was effective for these patients who were severely immune-compromised, as the cells successfully reached the tumor, multiplied and were able to kill tumor cells" said Dr. Helen Heslop, lead author of the study and professor of pediatrics and medicine and a member of the Center for Cell and Gene therapy at BCM, The Methodist Hospital and Texas Children's. The cell remained in the body for up to nine years, providing long-term protection.
Patients who undergo the transplants are often immune-suppressed. Because most people have been infected with Epstein-Barr virus, the lack of immune protection makes their lymph system vulnerable to adverse effects of the virus, especially lymphomas that can be traced directly back to the infection.
In this study, 114 patients who had received hematopoietic or blood-related stem cell transplants from an unrelated donor or a family member whose bone marrow was not a perfect match also received infusions of immune components called T-cells that were design to target Epstein-Barr virus-infected cells. The treatment was preventive in 101 patients, none of whom developed lymphomas associated with Epstein-Barr virus infection. Eleven of 13 patients who had this disease or symptoms of it had sustained remissions.
Because the cells were marked, researchers determined that the special cells remained in the body for as long as nine years. The cost of the therapy, which spares normal cells, was estimated at just over $6,000, which compares favorably to other treatments for the disorder.
Researchers infused the cells soon after the patients received the stem cell transplants, which could account for its success, said Heslop and her colleagues.
"With such a promising therapy, it's important that it is not only effective, but that it is a cost-effective option for high-risk patients," said Heslop.
Others who took part in this research include Martin A Pule, Alexandra Rousseau, Catherine M Bollard, Malcolm K Brenner and Cliona M Rooney, all of the Center for Cell and Gene Therapy at BCM, Methodist and Texas Children's; Hao Liu and Meng-Fen Wu of the Dan L. Duncan Cancer Center at BCM, Karen S. Slobod of Novartis Vaccine & Diagnostics in Cambridge, Mass.; ,Gregory A Hale, Colton A Smith, Richard J Rochester and Julia L Hurwitz of St. Jude Children's Research Hospital in Memphis, Tenn. and Persis J Amrolia of Great Ormond St. Children's Hospital in London, UK.
Funding for this work came from the National Institutes of Health, the Leukemia and Lymphoma Society, the National Cancer Institute, the Assisi Foundation and the American Lebanese Syrian Associated Charities.
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