In the past 30 years, there has been a small but significant increase in the incidence of advanced breast cancer in American women 25 to 39 years of age, according to a study published in the February 27 issue of JAMA.
During the same period, there was no increase in advanced disease in older women, according to the researchers, led by Rebecca H. Johnson, MD, from the Seattle Children's Hospital and the University of Washington.
In the young women, the incidence of breast cancer with distant involvement at diagnosis increased from 1.53 per 100,000 women in 1976 to 2.90 per 100,000 women in 2009. This is an absolute difference of 1.37 per 100,000, and is an average compounded increase of 2.07% per year (P < .001) over a 34-year interval.
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