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Breast MRI Scan Could Determine Need for Radiation Therapy
Date:9/21/2008

SEATTLE, Sept. 21 /PRNewswire/ -- For women whose breast cancer has spread to their lymph nodes, a magnetic resonance imaging (MRI) scan could replace exploratory surgery as the method for determining whether those women need radiation therapy to treat their disease, according to a study to be presented during the annual meeting of the American Society for Therapeutic Radiology and Oncology (ASTRO) which opens today in Boston.

In a retrospective study of 167 patients who underwent radiation therapy for invasive breast cancer after surgical staging of their tumors, physician researchers at the Seattle Cancer Care Alliance and University of Washington Medical Center found that the tumors' physiological information shown on MRI scans correlated with surgically based findings of cancer having spread to lymph nodes. This suggests that breast MRI could help determine if women scheduled to undergo surgery will later need radiation therapy and how much.

The findings are significant because the standard of care for women with breast cancer has evolved during the past five years. In the past, decisions regarding radiation therapy were made after surgery and before chemotherapy, according to lead author Christopher Loiselle, M.D., a resident in the Department of Radiation Oncology at UW Medical Center. Today, increasing numbers of women may be treated with chemotherapy before surgery.

"When you give chemotherapy first, and then perform the surgery to remove the cancer and sample the lymph nodes, you reduce your ability to know whether there was cancer in the axillary (underarm) lymph nodes before the patient was treated with chemotherapy," Loiselle said. "This raises the question: is there another way to stage those lymph nodes? Our study showed that tumor characteristics as seen on an MRI scan may be the answer."

The ultimate benefit is that some women can be spared radiation therapy, especially those with smaller tumors and tumors that have
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SOURCE Seattle Cancer Care Alliance
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