Feature | June 16, 2014

New analysis factors in impact of rising breast cancer rates due to other factors

Mammography Late-Stage Breast Cancers University of Michigan Study

June 16, 2014 — In the last 30 years, since mammography was introduced, late-stage breast cancer incidence has decreased by 37 percent, a new study from the University of Michigan Comprehensive Cancer Center finds.

The analysis takes into account an observed underlying trend of increased breast cancer incidence present since the 1940s, a sort of inflation rate for breast cancer.

Researchers looked at early-stage and late-stage breast cancer diagnoses between 1977-1979, before mammography became popular, and compared it to diagnoses between 2007-2009. Based on trends observed in the pre-mammography period of the 1940s to the 1970s as well as continued trends over time, the researchers took into account a central estimated increase in breast cancer incidence of 1.3 percent per year. This is called an annual percentage change, or APC.

Think of the APC like the inflation rate: $1 from 1977 does not go as far in 2007. Just as the cost of money rises, the number of breast cancer diagnoses is increasing, independently of efforts to detect it earlier.

In the current paper, published in Cancer, the researchers looked at the late 1970s data and projected incidence of early-stage and late-stage breast cancer in 2007-2009 based on the APC. They then compared the projected rates to actual rates.

Late-stage breast cancer incidence decreased 37 percent from the projected rate, and early-stage breast cancer incidence correspondingly increased 48 percent from 1977-1979 to 2007-2009. They also conducted similar analyses with other APC values, ranging from 0.5 to 2 percent. All estimates showed a substantial decrease in late-stage disease.

“When you factor in this temporal trend, our analysis shows that there has been a shift from late-stage to early-stage breast cancer over the last 30 years. This is what you would expect with a successful screening program. Not only are we detecting more early-stage cancer, but we are decreasing the number of late-stage cases that tend to be more challenging to treat and more deadly,” says senior study author Mark Helvie, M.D., professor of radiology and director of breast imaging at the University of Michigan Comprehensive Cancer Center.

There are many reasons why breast cancer incidence is increasing over time, including reproductive, dietary and environmental factors. Prior estimates showed a 1 to 3 percent annual increase in the United States and Europe before mammography screening began. In countries in Africa, Asia and Eastern Europe with no routine screening mammography, breast cancer rates are increasing as much as 3 to 5 percent per year.

Importantly, the current study also found that since mammography was introduced, there has been an overall 9 percent decrease in invasive breast cancer, when factoring in a 1.3 percent annual percentage increase. This has been offset by an increase in ductal carcinoma in situ, so-called stage 0 breast cancer, which is not invasive.

“While we have seen an increase in overall breast cancer incidence over the last 30 years, the drop in late-stage diagnoses is a positive benefit of mammography and our heightened awareness of early detection. The decrease in late-stage disease, together with improved treatments, contributes to the decreased mortality from breast cancer in the United States in the last 20 years,” Helvie says.

Additional authors: Joanne T. Chang, M.P.H., and Mousumi Banerjee, Ph.D., University of Michigan; and R. Edward Hendrick, Ph.D., University of Colorado.

For more information: www.newswise.com/institutions/newsroom/868/


Related Content

News | Breast Imaging

July 8, 2025 — QT Imaging Holdings, has appointed Elaine Iuanow, MD, as chief medical officer (CMO) and Kim Du as senior ...

Time July 09, 2025
arrow
News | Breast Imaging

July 7, 2025 — SimonMed Imaging, one of the largest outpatient medical imaging providers in the United States, has ...

Time July 08, 2025
arrow
News | Breast Imaging

June 25, 2025 — QT Imaging Holdings, Inc., a medical device company engaged in research, development, and ...

Time June 25, 2025
arrow
News | Mammography

April 29, 2025 — iCAD, a global provider of clinically proven AI-powered cancer detection solutions, has announced a ...

Time April 29, 2025
arrow
News | Mammography

April 24, 2025 — GE HealthCare will feature its latest advancements in diagnostic accuracy and patient-centered breast ...

Time April 24, 2025
arrow
News | Artificial Intelligence

March 10, 2025 — Lunit, a provider of AI-powered solutions for cancer diagnostics and therapeutics, has published a ...

Time March 10, 2025
arrow
News | Artificial Intelligence

Feb. 19, 2025 — SimonMed Imaging and HeartLung Technologies have signed a strategic partnership to offer HeartLung's AI ...

Time March 04, 2025
arrow
News | Ultrasound Imaging

Jan. 28, 2025 — GE HealthCare recently announced it has received 510(k) clearance from the United States Food and Drug ...

Time January 29, 2025
arrow
News | Breast Imaging

Jan. 8, 2025 — ScreenPoint Medical has acquiredf Biomediq A/S, a research-based company focused on the research ...

Time January 10, 2025
arrow
News | Breast Imaging

Dec.11, 2024 — iCAD, Inc., a provider of clinically proven AI-powered cancer detection solutions, recently announced ...

Time December 18, 2024
arrow
Subscribe Now