JCO Early Release, published online ahead of print Jun 4 2007
Journal of Clinical Oncology, 10.1200/JCO.2006.09.9572
Received November 14, 2006
Accepted April 2, 2007
Mammography Surveillance and Mortality in Older Breast Cancer Survivors
Timothy L. Lash,* Matthew P. Fox, Diana S.M. Buist, Feifei Wei, Terry S. Field, Floyd J. Frost, Ann M. Geiger, Virginia P. Quinn, Marianne Ulcickas Yood, and Rebecca A. Silliman
From the Departments of Epidemiology and International Health, Boston University School of Public Health; Geriatrics Section, Department of Medicine, Boston University School of Medicine, Boston; University of Massachusetts Medical School, Worcester; Fallon Community Health Plan, Worcester, MA; Group Health Center for Health Studies, Seattle, WA; HealthPartners Research Foundation, Minneapolis, MN; Lovelace Health Systems, Albuquerque, NM; Wake Forest University School of Medicine, Winston-Salem, NC; Kaiser Permanente Southern California, Pasadena, CA; Henry Ford Health System, Detroit, MI; and the Yale University School of Medicine, New Haven, CT.
* To whom correspondence should be addressed. E-mail: tlash{at}bu.edu
Purpose: There are more than 2,000,000 breast cancer survivors in the United States today. While surveillance for asymptomatic recurrence and second primary is included in consensus recommendations, the effectiveness of this surveillance has not been well characterized. Our purpose is to estimate the effectiveness of surveillance mammography in a cohort of breast cancer survivors with complete ascertainment of surveillance mammograms and negligible losses to follow-up.
Patients and Methods: We enrolled 1,846 stage I and II breast cancer patients who were at least 65 years old at six integrated health care delivery systems. We used medical record review and existing databases to ascertain patient, tumor, and therapy characteristics, as well as receipt of surveillance mammograms. We linked personal identifiers to the National Death Index to ascertain date and cause of death. We matched four controls to each breast cancer decedent to estimate the association between receipt of surveillance mammogram and breast cancer mortality.
Results: One hundred seventy-eight women died of breast cancer during 5 years of follow-up. Each additional surveillance mammogram was associated with a 0.69-fold decrease in the odds of breast cancer mortality (95% CI, 0.52 to 0.92). The protective association was strongest among women with stage I disease, those who received mastectomy, and those in the oldest age group.
Conclusion: Given existing recommendations for post-therapy surveillance, trials to compare surveillance with no surveillance are unlikely. This large observational study provides support for the recommendations, suggesting that receipt of surveillance mammograms reduces the rate of breast cancer mortality in older patients diagnosed with early-stage disease.
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