Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Risk of second cancer after breast cancer

09.12.2005


Women with breast cancer face increased risk of developing a second cancer



A new large-scale study on women with breast cancer found a 25 percent increase in the risk of developing a new non-breast cancer compared to women without cancer. The study, published online December 8, 2005 in the International Journal of Cancer, the official journal of the International Union Against Cancer (UICC), is available via Wiley InterScience.

Breast cancer is the most common cancer among women in developed countries. Due to the high five-year survival rate (77 percent), a considerable number of women have a long-term risk of developing a second cancer. Previous studies have shown a 20-30 percent increased risk for a second cancer in various sites, including the endometrium, ovary, thyroid, lung, soft tissue, blood, skin, stomach and colon, with higher risks among younger patients.


Researchers led by Lene Mellemkjær of the Danish Cancer Society in Copenhagen, Denmark conducted a huge study involving 525,527 patients with breast cancer in 13 cancer registries in Europe, Canada, Australia and Singapore. Records were analyzed for second primary cancers during the period 1943 to 2000, with 133,414 women followed for more than 10 years after the initial diagnosis of breast cancer. The increased risk of a second cancer was seen in many different sites, as shown in earlier studies. "The excess of cancer after a breast cancer diagnosis is likely to be explained by treatment for breast cancer and by shared genetic or environmental risk factors although the general excess of cancer suggests that there may be additional explanations such as increased surveillance and general cancer susceptibility," the authors note.

The study found an almost 6-fold increase in the risk of cancer in connective tissue of the thorax and upper limbs, which suggests that radiation therapy, which has been used to treat breast cancer since the beginning of the 20th century, may play a role in developing a second cancer in organs close to the breast. An increased risk of myeloid leukemia was also shown, possibly as a result of chemotherapy. In addition, while previous studies had shown an increased risk of endometrial cancer with the use of tamoxifen, the current study suggests that this may not be entirely due to the drug, since the increased risk was already shown within one year of breast cancer diagnosis, it was shown before 1975 when tamoxifen was rarely used, and an increased risk of breast cancer was also seen after endometrial cancer. Colorectal, kidney and postmenopausal breast cancer appear to share obesity as a risk factor, while ovarian cancer and breast cancer seem to have a genetic predisposition in common. The study found an excess of ovarian cancer already within one year of breast cancer diagnosis, along with an increased risk of breast cancer after ovarian cancer.

"The overall impression from this very large study is that a breast cancer diagnosis has an effect on subsequent cancer risk in general, since so many cancer sites were seen to occur in excess of what was expected," the authors conclude. "The known effects of treatment and common risk factors do not seem to fully explain the excesses."

David Greenberg | EurekAlert!
Further information:
http://www.interscience.wiley.com/journal/ijc

More articles from Health and Medicine:

nachricht Cholesterol-lowering drugs may fight infectious disease
22.08.2017 | Duke University

nachricht Once invincible superbug squashed by 'superteam' of antibiotics
22.08.2017 | University at Buffalo

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

What the world's tiniest 'monster truck' reveals

23.08.2017 | Life Sciences

Treating arthritis with algae

23.08.2017 | Life Sciences

Witnessing turbulent motion in the atmosphere of a distant star

23.08.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>