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Health & Medicine for Senior Citizens

Older Breast Cancer Patients Want Radioactive Implants, No Radiation for E+ Tumors

Women with estrogen negative tumors 91% more likely to die if they did not receive radiation therapy after a lumpectomy, finds second study

June 3, 2011 More older women 70 and older with stage I breast cancer are opting for radioactive implants, and those with estrogen positive tumors are opting out of radiation therapy, according to studies being presented Saturday at the American Society of Clinical Oncology meeting in Chicago. These are notable changes in past patterns of radiation usage among senior citizens.

This abstract by Jefferson University Hospital researchers received an ASCO Merit Award.

 

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In another abstract, the researchers report that women with estrogen negative tumors were 91 percent more likely to die from breast cancer if they did not receive radiation therapy after a lumpectomy.

Given the relatively recent developments in radiation therapy (i.e., an increased use of brachytherapy and external beams) and data supporting the idea that radiation isn't necessary for women with estrogen positive tumors, researchers wanted to see how actual practice patterns were impacted.

Researchers found that there was a modest increase in the percentage of women with estrogen receptor positive cancers who did not get radiation therapy starting around 2004, and increasing use of radioactive implants, such the MammoSite, Contura, Savi or similar devices, since 2002.

There was also a corresponding drop in women who received external beam radiation, according to Xinglei Shen, M.D., a resident in the Department of Radiation Oncology at Thomas Jefferson University Hospital. "Among women with estrogen receptor negative cancers, there was not the same increase in frequency of women who did not get radiation, but there was an increased use of radioactive implants," he said.

The consequence of those findings was determining what impact omitting radiation has on survival. While there is data that the omission of radiation therapy in women with estrogen receptor positive tumors who receive endocrine therapy, such as Tamoxifen, is not associated with a survival difference, limited data exists for estrogen receptor negative tumors in older women who undergo breast conservation.

"From the randomized trial data, we know that women with estrogen receptor positive stage I breast cancer have no detriment to survival by avoiding radiation, as long as they took Tamoxifen," Dr. Shen said. "However, it is unknown if this would be the case in women with estrogen receptor negative cancer."

Dr. Shen worked with Jefferson Medical College student Andrzej Wojcieszynski to examine survival in these women, and found that they were 91 percent more likely to die from breast cancer if they did not receive radiation therapy after a lumpectomy. (Abstract #1037).

"We have to be cautious when interpreting survival data from the SEER because of potential confounding variables, such as the health of the patients and use of chemotherapy," Dr. Shen said. "However, these data do raise hypotheses for future study."

"Our conclusion is that adjuvant radiation therapy after lumpectomy reduces breast cancer mortality in women over 70 with stage I, estrogen receptor negative breast cancers, and that radiation is currently underutilized in these women," said Wojcieszynski.

The Kimmel Cancer Center at Jefferson is one of a select group of National Cancer Institute-designated Clinical Cancer Centers in the nation. It was founded in 1991 with approximately 30 investigators in basic sciences. Today, the KCC has approximately 150 members that include physicians and scientists dedicated to discovery and development of novel approaches for cancer treatment.

Thomas Jefferson University, the largest freestanding academic medical center in Philadelphia, is composed of Jefferson Medical College, Jefferson College of Graduate Studies, Jefferson School of Population Health, Jefferson School of Health Professions, Jefferson School of Pharmacy, and Jefferson School of Nursing. Jefferson is regarded nationally as one of the best universities offering a range of comprehensive programs for the education of health professions. Thomas Jefferson University partners with Thomas Jefferson University Hospital, its education and clinical care affiliate.

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