Navigation Links
Study finds mammography screening reduces breast cancer mortality

OAK BROOK, Ill. Breast cancer screening with mammography results in a significant reduction in breast cancer mortality, according to long-term follow-up results of a large-scale Swedish trial. The results are published online in the journal Radiology.

"Mammographic screening confers a substantial relative and absolute reduction in breast cancer mortality risk in the long-term," said Stephen W. Duffy, M.Sc., professor of cancer screening at Queen Mary, University of London. "For every 1,000 to 1,500 mammograms, one breast cancer death is prevented."

The Swedish Two-County Trial of mammographic screening was the first breast cancer screening trial to show a reduction in breast cancer mortality from screening with mammography alone. The trial randomized 133,065 women into two groups, one that received an invitation to screening and another that received usual care. At the conclusion of the study, there were 30 percent fewer breast cancer deaths among all women (attenders and non-attenders) in the group invited to undergo screening. The screening phase of the trial lasted approximately seven years. Women between the ages of 40 and 49 were screened, on average, every 24 months, and women age 50 to 74 were screened, on average, every 33 months.

For the current study, nearly three decades after the beginning of the trial, the researchers analyzed the original data and the follow-up data to estimate the long-term effect of mammography screening on breast cancer mortality. At 29 years, this represents the longest recorded follow-up period for a mammography screening trial.

Case status and cause of death were determined by local trial end point committees and, independently, by an external committee. Mortality analysis at follow up showed a reduction in the breast cancer mortality rate in the screening population, similar to the original trial results. But while the relative effect of screening on breast cancer mortality remained stable over the follow-up period, the absolute benefit in terms of lives saved increased with longer follow-up times. At 29 years of follow-up, the estimated number of women needed to undergo screening every 2 or 3 years over a seven-year period to prevent one breast cancer death ranged from 414 to 519.

According to the researchers, evaluation of the full impact of screening mammography requires follow-up times exceeding 15 to 20 years, because the observed number of breast cancer deaths prevented increases with the passage of time.

"Most of the deaths prevented would have occurred more than 10 years after the screening started," Duffy said. "This indicates that the long-term benefits of screening in terms of deaths prevented are more than double those often quoted for short-term follow-up."

These new data add to the evidence on the long-term benefits of regular mammography screening, and should be included in the discussions between women and doctors about what to expect from breast cancer screening.

"Unfortunately, we cannot know for certain who will and who will not develop breast cancer," Duffy said. "But if you undergo a recommended screening regimen, and you are diagnosed with breast cancer at an early stage, chances are very good that it will be successfully treated."


Contact: Linda Brooks
Radiological Society of North America

Related medicine news :

1. Study shows long-term benefits of breast screening
2. Black members of Adventist church defy health disparities, study shows
3. Hospitals in U.S. Territories Have Higher Death Rates: Study
4. Study finds peat wildfire smoke linked to heart failure risk
5. Study reveals possible brain damage in young adult binge-drinkers
6. Study: Most parents unaware of teen workplace risks
7. Calories, Not Protein or Carbs, Are Key to Weight Loss: Study
8. Pregnancy Safe for Most Women With MS: Study
9. Study finds pregnancy safe in multiple sclerosis
10. Genetic study shows that low body fat may not lower risk for heart disease and diabetes
11. After Diabetes Diagnosis, Concentrate on Dietary Changes, Study Says
Post Your Comments:
(Date:10/13/2015)... Boulder, Colorado (PRWEB) , ... October 13, 2015 ... ... launched the first high-tech foam roller with 11 hours of vibrating power. Tested ... to reduce recovery time and increase athletic performance. , Mark's background in sporting ...
(Date:10/13/2015)... , ... October 13, 2015 , ... The American Institutes ... college campus health staff caring for students who have experienced sexual assault and other ... the White House during the Violence Against Women Act's 21st anniversary. ...
(Date:10/13/2015)... M.A. (PRWEB) , ... October 13, 2015 , ... Sir ... service to the local Boston chapter of Ronald McDonald House Charities® (RMHC®). This ... that has supported Sir Grout of Greater Boston since its inception. , “We believe ...
(Date:10/13/2015)... ... ... "My friend's son suffers from eczema, and he had a horrible habit ... Platteville, Colo. "I came up with this kit as a way to prevent children ... child from rubbing or scratching his or her face. This protects sensitive skin from ...
(Date:10/13/2015)... , ... October 13, 2015 , ... ... anesthesia and pain management services, today announced its partnership with WPC Healthcare ... data from disparate systems and organizes the data into an aggregated data repository ...
Breaking Medicine News(10 mins):
(Date:10/13/2015)... Oct. 13, 2015 Attracting mid- to large-sized medical ... to growing Baltimore into a major ... by the Maryland Technology Enterprise Institute (Mtech) . ... pieces in place to support innovation hubs and a thriving ... Mtech Baltimore. "This study is important because we believe ...
(Date:10/13/2015)... , Oct. 13, 2015  Graduate students ... care and medical research, will soon have the ... patient care – the drug discovery and development ... ) has collaborated with 10 leaders from academic ... "Making Medicines: The Process of Drug Development."  Lilly ...
(Date:10/13/2015)... SAN FRANCISCO , October 13, 2015 ... expected to reach USD 26.8 billion by 2022, according ... Anesthesia and respiratory devices, owing to their capability to ... expected to witness a substantial growth. --> ... reach USD 26.8 billion by 2022, according to a ...
Breaking Medicine Technology: