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Pediatric cancer survivors at risk for diseases that predispose them to heart disease

07.01.2010
Survivors of pediatric cancer are at greater risk for high cholesterol, diabetes and high blood pressure, all of which predispose them to heart disease. These risk factors for heart disease are being found at an earlier age than in the general population, according to research published in Cancer Epidemiology, Biomarkers & Prevention, a journal of the American Association for Cancer Research.

Lillian R. Meacham, M.D., medical director of the Cancer Survivor Program and professor of pediatrics at Emory University, extracted data from the Childhood Cancer Survivor Study, which included 8,599 cancer survivors and 2,936 of their siblings.

"In data previously published from the Childhood Cancer Survivor Study, pediatric cancer survivors were found to be at almost 10-fold greater risk for cardiovascular disease than their non-survivor counterparts," said Meacham. "In this study we identified whether the predisposing risk factors for cardiovascular disease — obesity, hypertension, hyperlipidemea and diabetes — were present at higher rates compared to siblings. If the risk factors could be recognized and treated early it is hoped some of the long-term cardiac side effects could be averted."

Meacham found that cancer survivors were nearly twice as likely as their siblings to take medication for high blood pressure, 60 percent more likely to take cholesterol medication and 70 percent more likely to have diabetes.

Radiation treatment may be playing a role in the development of risk factors for cardiovascular disease, Meacham said. Total body irradiation was linked with a 5.5-fold increased risk and chest and abdomen radiation a 2.2-fold increased risk of cardiovascular risk factor clustering, which when present is associated with subsequent cardiovascular disease.

"Mechanistically, we are not yet sure why this is, but the association is definitely there," said Meacham.

Researchers examined the presence of cardiovascular risk factors and found that physical inactivity among cancer survivors was linked with a 70 percent increased risk for cardiovascular risk factor clustering. Older age at the time of the study was linked to an 8.2-fold increased risk for cardiovascular risk factor clustering among survivors compared with children who had never had cancer.

"These risk factors are manifesting at about age 32, which is much younger than a non-cancer survivor would exhibit signs of cardiovascular risk factors," said Meacham. "Some have suggested that when you are a cancer survivor there are parts of you that wear out early, so we need to be vigilant about our follow-up of these patients in order to find these late effects early and intervene."

Read more about the cardiovascular risk of cancer drugs through an article by CR magazine, the AACR's publication for patients, survivors and scientists: http://www.crmagazine.org/archive/Fall2009/Pages/cardiacriskscancerdrugs.aspx

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The mission of the American Association for Cancer Research is to prevent and cure cancer. Founded in 1907, the AACR is the world's oldest and largest professional organization dedicated to advancing cancer research. The membership includes 30,000 basic, translational and clinical researchers; health care professionals; and cancer survivors and advocates in the United States and nearly 90 other countries. The AACR marshals the full spectrum of expertise from the cancer community to accelerate progress in the prevention, diagnosis and treatment of cancer through high-quality scientific and educational programs. It funds innovative, meritorious research grants, research fellowship and career development awards. The AACR Annual Meeting attracts more than 16,000 participants who share the latest discoveries and developments in the field. Special conferences throughout the year present novel data across a wide variety of topics in cancer research, treatment and patient care. The AACR publishes six major peer-reviewed journals: Cancer Research; Clinical Cancer Research; Molecular Cancer Therapeutics; Molecular Cancer Research; Cancer Epidemiology, Biomarkers & Prevention; and Cancer Prevention Research. The AACR also publishes CR, a magazine for cancer survivors and their families, patient advocates, physicians and scientists. CR provides a forum for sharing essential, evidence-based information and perspectives on progress in cancer research, survivorship and advocacy.

Jeremy Moore | EurekAlert!
Further information:
http://www.aacr.org

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