Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Protective effect of calcium in reducing colon cancer polyps lasts for years

19.04.2005


Long term use of calcium supplements provides a protective effect that lasts for years against development of potentially precancerous colon polyps, researchers at Dartmouth Medical School say.



Their study, presented at the 96th Annual Meeting of the American Association for Cancer Research, found that patients in the treatment group of a randomized trial of calcium supplements had a 36 percent reduction in polyp formation in the five years after the end of the trial, compared to patients in the placebo group.

Although the researchers believe it is premature to recommend widespread use of calcium supplements for chemoprevention, they say their research is the second major study that shows the value of calcium in protecting people at risk of developing worrisome polyps.


"This provides further evidence of the potential of calcium to be used as a chemopreventive agent against development of colorectal cancer," says the study’s lead author, Maria Grau, M.D., a research associate in the Section of Biostatistics and Epidemiology at Dartmouth. Co-author John Baron, M.D., a professor of medicine, will be presenting the results at AACR.

Calcium is the most abundant mineral in the body and is essential for the formation and repair of bone and teeth. It is known to play a role in such activities as nerve transmission, muscle contraction, and blood clotting.

It is also the only dietary substance that has been shown to be chemoprotective against development of colorectal polyps. The trial that proved that association, the Calcium Polyp Prevention Study, randomized 930 patients who had a history of developing precancerous adenoma to either 1200 mg. of elemental calcium supplements daily for four years, or to a placebo medication. Results demonstrated a statistically significant 19 percent overall reduction in polyp formation among participants who used the calcium supplements. The reduction in risk of advanced adenomas – more worrisome polyps with a closer association with cancer, was even larger at 28 percent.

The findings being reported at AACR is a continuation of that study. The Calcium Follow Up Study was designed as an observational phase to track polyp formation in those who participated in the Calcium Polyp Prevention Study, as well as to look at the effect of additional use of calcium supplements among the participants.

The Dartmouth research team obtained information on 822 of the original subjects, including detailed records from follow up colonoscopies performed on 597 participants.

Even while adjusting for the use of calcium supplements after the primary study was over, the researchers learned that patients who had been randomized to daily use of the mineral during the trial had a significant reduction (36 percent) in the development of new adenoma polyps during the first five years post-study. There was even a larger effect for protection against development of non-neoplastic hyperplastic polyps - a 48 percent reduction of risk.

But they also found that the protective effect diminished over time. Over the entire follow-up period, which was as much as 10 years in some patients, the protective effect fell to a non-significant 19 percent in patients who had used the supplements in the study. Patients who used calcium supplements after the randomized trial had ended had a non-significant 15 percent reduced risk of developing polyps.

Calcium’s long-term protective effect may be due to suppression of a precarcinogenic process that itself takes years to develop, Baron says, but adds that more study is needed to confirm that notion.

Warren R. Froelich | EurekAlert!
Further information:
http://www.aacr.org

More articles from Health and Medicine:

nachricht Collagen nanofibrils in mammalian tissues get stronger with exercise
14.12.2018 | University of Illinois College of Engineering

nachricht New discoveries predict ability to forecast dementia from single molecule
12.12.2018 | UT Southwestern Medical Center

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: Data use draining your battery? Tiny device to speed up memory while also saving power

The more objects we make "smart," from watches to entire buildings, the greater the need for these devices to store and retrieve massive amounts of data quickly without consuming too much power.

Millions of new memory cells could be part of a computer chip and provide that speed and energy savings, thanks to the discovery of a previously unobserved...

Im Focus: An energy-efficient way to stay warm: Sew high-tech heating patches to your clothes

Personal patches could reduce energy waste in buildings, Rutgers-led study says

What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...

Im Focus: Lethal combination: Drug cocktail turns off the juice to cancer cells

A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.

The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...

Im Focus: New Foldable Drone Flies through Narrow Holes in Rescue Missions

A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.

Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...

Im Focus: Topological material switched off and on for the first time

Key advance for future topological transistors

Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

ICTM Conference 2019: Digitization emerges as an engineering trend for turbomachinery construction

12.12.2018 | Event News

New Plastics Economy Investor Forum - Meeting Point for Innovations

10.12.2018 | Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

 
Latest News

Data use draining your battery? Tiny device to speed up memory while also saving power

14.12.2018 | Power and Electrical Engineering

Tangled magnetic fields power cosmic particle accelerators

14.12.2018 | Physics and Astronomy

In search of missing worlds, Hubble finds a fast evaporating exoplanet

14.12.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>