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Survival differences by race most apparent in advanced stages of breast cancer

Racial differences in breast cancer survival increase according to stage of disease, a new study finds. Published in the September 15, 2007 issue of CANCER, a peer-reviewed journal of the American Cancer Society, a retrospective analysis of survival data demonstrates that within each stage, African American women had larger tumors and were more likely to have disease that had spread to nearby lymph nodes. After controlling for those clinical factors the racial disparities in survival persisted. The investigators say their finding that disparities in survival increased with more advanced disease was surprising and suggested that non-clinical factors contributed to survival differences.

Epidemiology studies have long showed significant racial/ethnic differences in breast cancer survival among U.S. women. African American women have poorer five-year survival rates, and more advanced disease at the time of diagnosis than white women. Whether these disparities are due to a difference between races in tumor biology or to socioeconomic factors that impact healthcare access and/or the physician-patient relationship continues to be unclear.

One key piece of evidence is that, stage for stage, African American women have worse clinical outcomes than white women. However, staging disease is complex, taking into account tumor size and regional or distant disease spread. Also, there can be significant differences in survival within each stage. For example, survival at the same stage can vary by 40 percent depending on the number of lymph nodes with disease.

Dr. Alfred Neugut from Columbia University Medical Center, Russell McBride from Mailman School of Public Health and their colleagues hypothesized that racial differences in survival within stage could be attributed to differences in tumor size and the number of lymph nodes with disease between the two race groups.

Analysis of clinical and demographic characteristics from 256,174 wo
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Contact: Amy Molnar
amolnar@wiley.com
John Wiley & Sons, Inc.
13-Aug-2007


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