Older Women Who Delay Mammography Screening More Likely to Die From Breast Cancer

• Time from last mammogram to diagnosis significantly affected breast cancer mortality for women diagnosed after age 75.
• Data suggest a role for continued mammography screening in older women.

WASHINGTON, D.C. — Older women with an extended period of time between their last mammogram and breast cancer diagnosis were at an increased risk for breast cancer mortality, suggesting a role for continued mammography screening among women aged 75 years and older, according to data presented at the AACR Annual Meeting 2013, held in Washington, D.C., April 6-10.

“We found that for women age 75 and older, a longer time interval between the last mammogram and the date of breast cancer diagnosis was associated with a greater chance for dying from breast cancer,” said Michael S. Simon, M.D., M.P.H., leader of the breast multidisciplinary team at Barbara Ann Karmanos Cancer Institute in Detroit, Mich., and professor of internal medicine and oncology at Wayne State University School of Medicine.

To evaluate whether time between mammograms affected breast cancer mortality, Simon and colleagues analyzed data from 8,663 women in the Women’s Health Initiative observational study or clinical trial who had been diagnosed with breast cancer during a 12.2-year follow-up.

An interval of five or more years between a woman’s last mammogram and breast cancer diagnosis was associated with advanced-stage disease in 23 percent of women compared with 20 percent of women with an interval of six months to a year, a statistically significant difference, which may affect large numbers of women.

In an adjusted analysis, researchers found a longer interval between mammogram and diagnosis was associated with a significantly increased risk for breast cancer mortality among women aged 75 or older at diagnosis. Women aged 75 years or older at diagnosis who had an interval of five years or more between mammogram and diagnosis or who had never had a mammogram had a threefold greater risk for death from breast cancer compared with women who had an interval of six months to a year between mammogram and diagnosis. These relationships were not found among younger women.

“I am not sure why we are seeing these results particularly for older women. Tumors of younger women were more likely to be a little more unfavorable overall,” Simon said. “It is possible that the differences in the relationship between screening interval and mortality in older versus younger women may be related to the more aggressive nature of the tumors in younger women, which might obliterate the effects of more screening. Other reasons may include differences in cancer treatment, information that was not available for this cohort of women.”

According to Simon, physicians should discuss the risks and benefits of mammography with older patients and encourage them to continue mammography screening. “Our findings suggest that regular mammography should be continued for older women every one or two years; however, as with younger women, mammography screening should be considered in light of the overall health of the individual woman,” he said.

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About the American Association for Cancer Research
Founded in 1907, the American Association for Cancer Research (AACR) is the world’s first and largest professional organization dedicated to advancing cancer research and its mission to prevent and cure cancer. AACR membership includes more than 34,000 laboratory, translational and clinical researchers; population scientists; other health care professionals; and cancer advocates residing in more than 90 countries. The AACR marshals the full spectrum of expertise of the cancer community to accelerate progress in the prevention, biology, diagnosis and treatment of cancer by annually convening more than 20 conferences and educational workshops, the largest of which is the AACR Annual Meeting with more than 17,000 attendees. In addition, the AACR publishes eight peer-reviewed scientific journals and a magazine for cancer survivors, patients and their caregivers. The AACR funds meritorious research directly as well as in cooperation with numerous cancer organizations. As the scientific partner of Stand Up To Cancer, the AACR provides expert peer review, grants administration and scientific oversight of team science and individual grants in cancer research that have the potential for near-term patient benefit. The AACR actively communicates with legislators and policymakers about the value of cancer research and related biomedical science in saving lives from cancer. For more information about the AACR, visit www.AACR.org.

Media Contact:
Jeremy Moore
(215) 446-7109
Jeremy.Moore@aacr.org
In Washington, D.C.,
April 6-10, 2013:
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