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Radiotherapy can cause lasting vascular disease
Date:3/22/2010

For an as yet unknown reason, cancer radiotherapy can increase the risk of cardiovascular disease later in life, a problem that is growing as more and more people survive their cancer diagnosis. New research from Karolinska Institutet now suggests that sustained inflammation induced by post-radiotherapy changes in the gene expression in the arteries could be the cause.

Epidemiological studies have shown that a course of radiotherapy increases the risk of cardiovascular disease in the same part of the body; for example, myocardial infarction after left-side breast cancer treatment, or stroke after the treatment of head and neck or brain tumours. Scientists know very little, however, about the biological causes of these serious side-effects, which often do not appear until many years following treatment.

"Studies have been hampered by the fact that the disease process is so slow," says Martin Halle, researcher at Karolinska Institutet. "Cell studies and animal studies are best suited to the more immediate effects, and studies on human subjects have been ruled out for ethical reasons."

By studying autografts that have been carried out after cancer, Martin Halle and colleagues have now for the first time managed to study the long-term effects of radiotherapy on human blood vessels. This type of autograft involves the transplantation of skin, muscle or bone tissue from one part of a patient's body to reconstruct defects that arise after the removal of a tumour in another, often irradiated, part. By harvesting biopsies from previously irradiated branches of the carotid arteries and non-irradiated arteries from grafts, the researchers have been able to compare the difference in global gene expression between irradiated and non-irradiated arteries from the same patient at the same time.

They found that the irradiated arteries showed signs of chronic inflammation and an increase in activity of Nuclear Factor- kappaB (NF-kappaB), a t
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Contact: Katarina Sternudd
katarina.sternudd@ki.se
46-852-483-895
Karolinska Institutet
Source:Eurekalert

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