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May 6 -New Study Finds Mammogram Benefits for Women Beyond 80 Women over the age of 80 can benefit from mammography, according to researchers at The University of Texas M. D. Anderson Cancer Center. It's estimated that approximately 17% of breast cancers are diagnosed in women older than 80, and only about one fifth of women in this age group have routine mammograms. Currently, there are no clear guidelines for regular screenings of women older than 80. "With an increasing number of people living longer, there's a real dilemma regarding how best to manage the care of breast cancer patients 80 years of age and older, taking into account both their comorbidities and their quality of life," says Gildy Babiera, MD, an associate professor in the Department of Surgical Oncology. The American Cancer Society recommends annual mammography screening for women starting at age 40 with no age limit for women in good health. Other organizations that recommend screening guidelines differ both in age ceilings as well as how often mammograms should be conducted in older women. The study, published online in the Journal of Clinical Oncology, is the first to specifically assess the screening modality in women older than 80. It found that mammography significantly reduces the risk of being diagnosed with advanced stage breast cancer in this age group. Babiera, Brian Badgwell, MD, a fellow in M. D. Anderson's Department of Surgical Oncology, and their colleagues used information from the National Cancer Institute Surveillance, Epidemiology, and End Results database for the years 1996-2002, and looked at mammography rates in the five years prior to diagnosis. In total, 12,358 women over age 80 were analyzed. Patients were stratified into nonusers (women who did not have mammograms), 49%; irregular users (women who had one or two mammograms), 29%; and regular users (women who had three or more mammograms.), 22%. Sixty-eight percent of regular users were more likely to be diagnosed with early disease, stage 1 while nonusers (56%) and irregular users (33%) were more often diagnosed with stages 2, 3, or 4. The five-year survival rate was 94% in regular users, compared to 88% in irregular users, and 82% in nonusers. Despite these rates, the researchers were not able to find an increase in overall survival because those getting mammograms were healthier and, therefore, more likely to live longer, says Badgwell, the study's first author. "For example, in our study, we showed a 12% decrease in the risk of breast cancer death for each mammogram. However, in the women who received mammograms, we also showed a 12% decrease in non-breast cancer death, thereby showing the bias for women who were healthy and receiving mammograms," says Badgwell. Babiera and Badgwell acknowledge their study’s limitations but feel this type of retrospective data may be the best that can be obtained because it's unlikely a randomized control trial could ever be conducted. "Now that we have this data and we know that mammography improves survival in the younger population, it would be difficult to conduct a randomized trial and stratify women of any age to a control group to not receive mammography," says Badgwell. Instead, the researchers stress that physicians should review each woman's situation personally to determine if a mammogram is in her best interest, and if she is found to have breast cancer, could her quality of life be managed appropriately. "Finding breast cancer early in this age group may not result in survival benefit, and it may even increase unnecessary angst in elderly women with other ailments. On the other hand, if the woman is otherwise healthy and could be a surgical candidate, should breast cancer be found by a routine mammogram, perhaps she could be offered less invasive treatment and spared from toxic therapies given to women diagnosed with advanced breast cancer," says Babiera. Source: M. D. Anderson Cancer Center
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