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Long-term cancer risk follows stem cell transplant recipients

Hematopoietic stem cell transplant (HSCT) recipients face a significant long-term risk for developing a second cancer, particularly if they were older at the time of transplant or received stem cells from a female donor, according to a new study. Published in the January 1, 2007 issue of CANCER (http://www.interscience.wiley.com/cancer-newsroom), a peer-reviewed journal of the American Cancer Society, the study reveals that within 10 years of an allogeneic HSCT, the relative risk of a second, solid cancer is almost twice that of the general population. In addition, cancer risk almost quadruples for patients who were over 40 years old at the time of transplant or for patients who received stem cells from a female donor.

Myeloablative, allogeneic HSCT is an effective standard therapy for specific life-threatening diseases, such as leukemia or myelodysplastic syndrome, for which blood cell lineages (which originate principally in the bone marrow and circulate in the blood) are abnormal. Destroying the patient's own unhealthy stem cells in the bone marrow and replacing them with a compatible donor's stem cells offers the chance of cure for a disease that otherwise has a high mortality rate with non-transplant therapies. While the procedure can be lifesaving, it is associated with serious short-term adverse effects, such as mucostitis, infections, and liver vascular obstruction as well as the potential long-term complication of developing of a second, usually solid cancer.

To estimate the risk and identify risk factors associated with this outcome, Genevieve Gallagher, M.D. and Donna L. Forrest, M.D. of the BC Cancer Agency and the University of British Columbia, retrospectively reviewed the medical records of 926 patients treated with myeloablative stem cell transplants over an 18-year period.

They found that at their institution the 10-year incidence of second cancers in these p
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Source:John Wiley & Sons, Inc.


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