(HealthDay News) — There appears to have been a decrease in late-stage breast cancer in the mammography era, according to a study published online May 19 in Cancer.

Mark A. Helvie, M.D., from the University of Michigan Health System in Ann Arbor, and colleagues examined trends in late-stage cancer and invasive cancer incidence using data from the Surveillance, Epidemiology, and End Results program. They compared data from the premammography period (1977 to 1979) with the mammographic screening period (2007 to 2009) for women aged ≥40 years. Prescreening temporal trends were estimated based on annual percentage change (APC) values. Prescreening stage-specific incidence values were adjusted using differing APC values.

The researchers found that the prescreening APC temporal trend estimates varied from 0.8 to 2.3 percent. With an APC of 1.3 percent (which approximated the four-decade Connecticut Tumor Registry trend of 1.2 percent) there was a 37 percent decrease in late-stage breast cancer incidence (56 cases per 100,000 women), with a reciprocal increase noted in early-stage rates. At APCs of 0.5 and 2.0 percent, late-stage cancer incidence decreased by 21 and 48 percent, respectively. There was a 9 percent decrease (27 cases per 100,000 women) in total invasive breast cancer at an APC of 1.3 percent.

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“There is evidence that a substantial reduction in late-stage breast cancer has occurred in the mammography era when appropriate adjustments are made for prescreening temporal trends,” the authors write.

Two authors disclosed financial ties to GE Healthcare.

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