понедельник, 8 апреля 2013 г.

New Non Invasive Test For Detection Of Tumors Of The Colon Is More Accurate Than Previously Used

New Non Invasive Test For Detection Of Tumors Of The Colon Is More Accurate Than Previously Used.
A rejuvenated noninvasive assess to discover pre-cancerous polyps and colon tumors appears to be more exact than simultaneous noninvasive tests such as the fecal arcane blood test, Mayo clinic researchers say. The sifting for a exceptionally accurate, noninvasive possibility to invasive screens such as colonoscopy or sigmoidoscopy is a "Holy Grail" of colon cancer research zencense. In a prelude trial, the unfledged probe was able to ally 64 percent of pre-cancerous polyps and 85 percent of full-blown cancers, the researchers reported.

Dr Floriano Marchetti, an underling professor of clinical surgery in the partitioning of colon and rectal surgery at University of Miami Sylvester Comprehensive Cancer Center, said the recent evaluation could be an high-ranking adjunct to colon cancer screening if it proves itself in further study. "Obviously, these findings lack to be replicated on a larger scale," he said bestpromed org. "Hopefully, this is a sterling head start for a more conscientious test".

Dr Durado Brooks, guide of colorectal cancer at the American Cancer Society, agreed. "These findings are interesting," he said. "They will be more spellbinding if we ever get this courteous of evidence in a screening population".

The study's move researcher remained optimistic. "There are 150000 unripe cases of colon cancer each year in the United States, treated at an estimated expenditure of $14 billion," illustrious Dr David A Ahlquist, professor of prescription and a physician in gastroenterology at the Mayo Clinic in Rochester, Minn. "The pipedream is to eradicate colon cancer totally and the most realistic approach to getting there is screening," he said. "And screening not only in a situation that would not only detect cancer, but pre-cancer. Our assay takes us closer to that dream".

Ahlquist was scheduled to nearby the findings of the inquiry Thursday in Philadelphia at a meeting on colorectal cancer sponsored by the American Association for Cancer Research. The untrodden technology, called the Cologuard sDNA test, insides by identifying precise altered DNA in cells weep by pre-cancerous or cancerous polyps into the patient's stool.

If a DNA singularity is found, a colonoscopy would still be needed to affirm the results, just as happens now after a confident fecal alchemic blood test (FOBT) result. To undergo whether the test was effective, Ahlquist's rig tried it out on more than 1100 frozen stool samples from patients with and without colorectal cancer.

The study was able to smell 85,3 percent of colorectal cancers and 63,8 percent of polyps bigger than 1 centimeter. Polyps this immensity are considered pre-cancers and most apt to to broadening to cancer, Ahlquist said.

The receptibility of the test is much better than what has been seen in other stool screening tests, the ACS' Brooks added. "But, showing that in a everyday put together of samples is very different from demonstrating that in a populace where only a small number of individuals are going to have polyps of that size. Then we will grasp if this is a big step forward," he said.

According to Ahlquist, Cologuard is the principal noninvasive check-up to detect pre-cancerous polyps, he added. In addition, the analysis is the only one that is able to identify cancer in all locations throughout the colon, something which other tests either can't or don't do well, Ahlquist said. One more advantage: patients do not basic to do any unorthodox putting together before winsome the test, something that other tests require, he added.

Ahlquist notable that the test still needs to be refined. "We scholarly there are still some bugs and we can make the prove even better," he said. Cologuard is not yet available for sale. Clinical trials comparing the proof with colonoscopy are slated to bulge next year. Ahlquist hopes that the examination will be approved and available within two years.

Ahlquist famed that the cost of the test has not yet been established. It is expected to sell for more than a fecal occult blood test, but far less than a colonoscopy. A fecal obscure blood trial can cost as little as $23 while a colonoscopy can add up to $700.

Another benefit is that it would presumably need to be done once every three years, while the fecal impenetrable blood test is usually done yearly. Savings over while on a more accurate test done fewer times could legitimize the higher cost of the Cologuard test, Ahlquist said. In two other presentations at the meeting, researchers have linked clarification gene variants to the jeopardy for colon cancer and also to the projection of the disease.

In one study, researchers found that masses who have desire telomeres, the small strips of DNA that sit in the ends of chromosomes, have a 30 percent increased hazard of developing colon cancer. "Even for mobile vulgus their age, their telomeres were longer than you'd look forward for healthy people," lead researcher Dr Lisa A Boardman, an fellow professor of cure-all at the Mayo Clinic, said in a statement. "This suggests that there may be two unheard-of mechanisms that touch telomere length and that set up susceptibility to cancer," she said.

In the other study, a investigating set led by Kim M Smits, a molecular biologist and epidemiologist in the GROW-School for Oncology and Developmental Biology at Maastricht University Medical Center in the Netherlands, uncovered a stagger when it came to a gene separate on the KRAS gene called the G variant. This variant, elongate linked to poorer outcomes in advanced colorectal cancer, in fact predicted a better prediction in early-stage colon cancer. "You would intuitively characterize that the G distinct would be associated with a poorer prognosis, as it is in late-stage colorectal cancer, but that is not the case," Smits said in a statement reviews. Experts locale out that studies presented at painstaking meetings do not have to behind the times the rigorous marquess look over of studies published in worthy journals.

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