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Obesity Significantly Increases Side Effects of Stereotactic Body Radiation Therapy in Lung Cancer Patients
Date:11/2/2009

CHICAGO, Nov. 2 /PRNewswire-USNewswire/ -- Obesity, not the amount of radiation given, is the greatest factor in whether early-stage lung cancer patients develop chest wall pain after receiving stereotactic body radiation therapy to the chest wall, with obese patients being more than twice as likely to develop chronic pain compared to those who have less body weight, according to a first-of-its-kind study presented Tuesday, November 3, 2009, at the 51st Annual Meeting of the American Society for Radiation Oncology (ASTRO).

Researchers studied other factors associated with obesity, such as diabetes, to find out why obesity in patients increased chest wall pain. Findings show that obese patients who are diabetic are over three times more likely to develop chest wall pain after receiving stereotactic body radiation therapy to the chest wall, compared to patients who do not have diabetes.

"The study shows that physiological factors, such as obesity and diabetes, can play a major role in the development of radiation-related toxicity," James Welsh, M.D., lead author of the study and a radiation oncologist at the M.D. Anderson Cancer Center in Houston said. "This is a surprising finding, since most side effects of radiation treatment are based on the amount of normal tissue that is treated and the volume of the dose."

The main purpose of the study was to find out what the highest amount of radiation that could be delivered to the chest wall using a specialized type of radiation treatment called stereotactic body radiation therapy (SBRT) without patients developing the late side effects of pain and skin reactions. The study shows that patients who receive a high dose of radiation to cancer close to the chest wall (in the amount of 35 gray (Gy)) have an increased chance of having pain and skin reactions, compared to those who have a lower radiation dose.

SBRT is a specialized type of external beam radiation therapy that pi
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SOURCE American Society for Radiation Oncology
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