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Gentler chemotherapy before stem cell transplant causes long-term remission of follicular lymphoma
Date:12/10/2007

ATLANTA - Treating relapsed follicular lymphoma patients with a milder chemotherapy regimen before they receive a blood stem cell transplant from a donor resulted in long-term complete remission for 45 of 47 patients in a clinical trial, researchers at The University of Texas M. D. Anderson Cancer Center report at the 49th annual meeting of the American Society of Hematology.

The two patients who had relapsed after the treatment regained a complete response after additional therapy.

"Our results show that this approach may actually be curative of follicular lymphoma," says lead author Issa Khouri, M.D., professor in M. D. Anderson's Department of Stem Cell Transplantation. "No other treatments produce this type of response."

The traditional treatment before receiving a matched stem cell donation consists of higher-dose chemotherapy that kills the lymphoma cells and shuts down the patient's own blood-producing stem cells - a process called myeloablation. While waiting for the donor's stem cells to engraft in the bone marrow and to begin producing blood, patients are vulnerable to infection, bleeding, and anemia.

Early research by Khouri and colleagues indicated that using a nonmyeloablative chemotherapy approach could control the lymphoma while sparing patients the side effects of high-dose chemotherapy. The transplanted blood stem cells launch an immune system attack on the lymphoma, a process called graft-vs.-lymphoma immunity.

"Our early results were encouraging. But with follicular lymphoma you need a long follow-up to see if the results hold," Khouri says. "This disease tends to recur later on, sometimes years after chemotherapy."

All patients in the present trial have been followed for at least five years, some for up to nine years. Trial patients had received 2 to 7 different chemotherapy regimens. Eight had received transplants of their own stem cells. At transplantation, 29 were in partial remission
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Contact: Scott Merville
sdmervil@mdanderson.org
713-516-4855
University of Texas M. D. Anderson Cancer Center
Source:Eurekalert

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