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Date d'inscription : 23/02/2005

MessageSujet: détection précoce du cancer.   Jeu 7 Fév 2008 - 13:52

(Feb. 7, 2008) — Researchers at the University of Nebraska Medical Center (UNMC) in Omaha have assisted in a significant discovery – the understanding of a common mechanism of cancer initiation – that could result in better cancer assessment, prevention and detection.

Des chercheurs ont fait une découverte significative qui pourrait résulter dans une meilleure prévention et une meilleure détection.

“We have a novel approach to cancer. We know the initiating step,” said Ercole Cavalieri, Ph.D., of the University of Nebraska Medical Center. “We think prevention of cancer can be solved by eliminating this initiating step.”
Eleanor Rogan, Ph.D., a UNMC research collaborator, continued: “We have found the first step that starts a cell down the road to becoming a cancer cell. By preventing this first step from happening, we think we can stop the development of breast or prostate cancer. The combination of an early detection test for cancer risk with administration of preventing agents should enable us to significantly reduce the number of women and men that develop breast or prostate cancer.” "

Nous avons une nouvelle approche du cancer. Nous connaissons la première étape" dit un chercheur de l'université du Nebraska "Nous avons découvert la première étape qui fait que la cellule devient une cellule cancéreuse. En prévenant cette première étape nous pensons pouvoir arrêtre le dévelppement du cancer du et celui de la . La combinaison d'une détection précoce et de l'administration des agents préventifs pourra nous permettre de réduire le nombre d'hommes traités pour le cancer de la prostate et de femmes traitées pour le cancer du sein.

The researchers have discovered that certain estrogen derivatives (metabolites) can react with deoxyribonucleic acid (DNA) to cause damage that may initiate a series of events leading to breast, prostate and other cancers. They found evidence in a simple urine test in humans. Estrogens can initiate cancer when natural mechanisms of protection do not work properly in the body, allowing estrogen metabolites to react with DNA.

Les chercheurs ont découvert que certains dérivés de l'oetrogène peuvent réagir avec l'ADN pour faire des dommages qui initient une série d'évênements liés au cancer de la prostate, du sein et de d'autres cancers. Ils en ont trouvé la preuve dans un simplesimple test d'urine. Les oestrogènes peuvent causer le cancer quand les mécanismes de protection ne fonctionnent pas adéquatement dans le corps permettant aux métabolites de réagir avec l'ADN.

“If these protections are insufficient, due to genetic, lifestyle or environmental influences, we think cancer can result,” Dr. Cavalieri said. “Now that we have the basic knowledge about this unifying mechanism of cancer initiation, we have a greater sense of urgency to assess people at risk and, at the same time, begin studies of prevention by using specific natural compounds.”

Maintenant que nous avons cette connaissance nous voulons protéger les gens avec des composés naturelles.

The findings are published in the December issue of the International Journal of Cancer. Findings were confirmed in a second, larger study and presented at a recent gathering of international scientists and physicians in San Antonio, Texas. The study involves researchers at the University of Nebraska Medical Center, Mayo Clinic and the Italian National Cancer Institute. A majority of the study was funded by the U.S. Army Breast Cancer Research Program Center of Excellence Award. Similar findings were reported and published about prostate cancer in the journal The Prostate in 2006.

The screening test developed by the researchers analyzes estrogen metabolite profiles in humans and can simultaneously associate the profile with risk of getting breast cancer. It involves testing a one-ounce sample of urine using a sophisticated method called tandem mass spectrometry, which analyzes about 40 estrogen-related compounds, including estrogen-DNA adducts formed by a chemical reaction of estrogen metabolites and DNA.
Researchers say the results are exciting because they show women at high risk of breast cancer can be identified by the level of adducts in a urine sample.

Researchers analyzed estrogen-DNA from 46 women with normal risk for breast cancer, 12 women at high risk of developing breast cancer, and 17 women diagnosed with breast cancer. They found women at high risk of breast cancer and the women with breast cancer had significantly higher levels of the estrogen-DNA adducts in their urine samples, while the women with normal risk for breast cancer had low levels.

“This is a very big step because we have a test in humans to determine the risk of getting breast or prostate cancer long before the tumor appears,” Dr. Cavalieri said. “We can use these estrogen-DNA adducts as a measure of cancer risk. In addition, we have begun to establish how effective natural compounds may be at preventing cancer by determining their ability to reduce the levels of these adducts in urine.”

He also said accumulating evidence suggests that specific metabolites of estrogens, if abundantly formed, can become cancer-initiating agents by reacting with DNA and generate mutations leading to cancer. DNA is composed of four bases, called adenine, guanine, cytosine and thymine, the alphabet of genetic information.

Estrogen metabolites react predominantly with the first two DNA bases, adenine and guanine, to form estrogen-DNA adducts, Cavalieri said. The resulting damage generated by the reaction can give rise to mutations that eventually initiate cancer. The important estrogen-DNA adducts spontaneously fall out of the DNA, leaving behind gaps that generate the cancer-initiating mutations.

The estrogen-DNA adducts eventually make their way out of cells and are excreted in urine.
“This finding identifies a new biomarker in the urine which appears to correlate with a women's risk of developing breast cancer,” according to Kenneth Cowan, M.D., Ph.D., director of the UNMC Eppley Cancer Center. “While these studies need to be confirmed in a prospective study in a larger group of patients, this could become an important screening assay for women and could lead to new therapies to prevent breast cancer.”

Dr. Cavalieri said one of the major obstacles in cancer research is related to the concept that cancer is a problem of 200 diseases, a viewpoint that has impeded researchers from looking at the origin of cancers because the search would be prohibitively complex. And for this reason, he said, the origin of breast, prostate and other human cancers has been virtually unknown.

While the expression of various cancers coincides with the concept of 200 diseases, some scientists believe a common origin is a factor for many prevalent types of cancer. There is widespread agreement in the scientific community that cancer is triggered by genetic mutations in critical genes, he said.

Jose Russo, M.D., senior member from the Fox Chase Cancer Center in Philadelphia, said: “The article is the best example of translational research. They have generated a unified concept of carcinogenesis and obtained a practical marker detectable in the urine of breast cancer patients. This article provides the adequate setting to explore this concept further by laying the basis to prepare a set of prospective clinical trials testing the preventive effects of the agents or mixtures of agents that can intercept the initiation event in breast or other cancers.”

David G. Longfellow, Ph.D., president and chief executive officer of the Toxicology Forum, an international, nonprofit organization devoted to conducting open dialogues among various segments of society concerned with problems in toxicology, said the work represents a paradigm shift in detection of cancer risk in humans and provides the earliest possible rational marker for prevention strategies and regimens.

“This work conveys a very exciting message that breast and prostate cancer risk can be identified years before the development of a tumor and suggests that natural preventive agents may be effectively used to prevent the initiation step in cancer,” Dr. Longfellow said. “Although this is a single manuscript, it is based on an extensive body of work in animal models and humans which consistently supports these findings and is complemented by collaboration with many international cancer scientists.”

"Ce travail porte un message encourageant, celui que le cancer de la prostate et du sein peuvent être identifiés des années avant le développement d'une tumeur et suggèrent que des agents naturels préventifs peuvent être employé pour l'empêcher de se déployer."
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