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Risk of cardiac death after radiotherapy for breast cancer has declined, study finds

The risk of ischemic heart disease that is associated with radiotherapy for breast cancer has substantially decreased in the last 25 years, according to a new study in the March 16 issue of the Journal of the National Cancer Institute.

In 2002, about 42% of women with breast cancer received adjuvant radiation therapy after surgery. Adjuvant radiation therapy decreases a woman's risk of local recurrence of her cancer but can increase her risk of death from ischemic heart disease. Patients with left-sided breast tumors receive a higher radiation dose to the heart than patients with right-sided tumors. However, modifications in radiation techniques over time have been able to reduce the radiation dose to the heart, which may affect the risk of cardiac death.

To determine whether the risk of death from ischemic heart disease resulting from radiation therapy to the breast has decreased over time, Sharon H. Giordano, M.D., M.P.H., of the University of Texas M. D. Anderson Cancer Center in Houston, and colleagues examined data from the National Cancer Institute's Surveillance, Epidemiology, and End Results (SEER) program. They compared ischemic heart disease mortality in women diagnosed with left-sided versus right-sided breast cancer from 1973 to 1979, 1980 to 1984, and 1985 to 1989.

The researchers found that the risk of death from ischemic heart disease among these women declined over time. Among women diagnosed between 1973 and 1979, those with left-sided tumors had a higher rate of 15-year mortality from ischemic heart disease (13.1%) compared with women with right-sided tumors (10.2%), but there was no statistically significant mortality difference among women diagnosed from 1980 to 1984 (9.4% versus 8.7%) or from 1985 to 1989 (5.8% versus 5.2%). The authors note that the increase in the risk of death from ischemic heart disease was not apparent until late in the first decade of follow-up.

"These encouraging data suggest that
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Contact: Sarah L. Zielinski
jncimedia@oupjournals.org
301-841-1287
Journal of the National Cancer Institute
15-Mar-2005


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